I have a Visualforce page that's a table where the user can add or delete rows. The rows contain key value pairs of data that, when saved, are aggregated into a delimited string and updated. It's basically a way of input control for our users because the number of rows can be dynamic. Here is the page:

<apex:page standardController="Account" extensions="LegalIdController">
	
	<apex:form >      
        <apex:pageBlock title="Manage Legal Ids">
            <apex:outputPanel id="legalIdHead">
                <apex:variable value="{!0}" var="rowNum"/>
                <apex:pageBlockSection columns="1">
                    <apex:pageBlockTable value="{!legalIdRowList}" var="legalIdRow" >
                        <apex:column headerValue="Id Type">           
                        	<apex:selectList size="1" id="countryList" value="{!legalIdRow['legalIdType']}" disabled="{!NOT(legalIdRow['doEdit'])}">
	    						<apex:selectOptions value="{!legalIdTypes}"/>
	    					</apex:selectList>
                        </apex:column>
                        <apex:column headerValue="Id Value">
                            <apex:inputText value="{!legalIdRow['legalIdValue']}" disabled="{!NOT(legalIdRow['doEdit'])}"/>
                        </apex:column>
                        <apex:column headerValue="Action">
                            <apex:commandLink value="Edit" style="color:red" action="{!allowEditForLidRow}" reRender="legalIdHead" rendered="{!NOT(legalIdRow['doEdit'])}">
                                <apex:param value="{!rowNum}" name="rowToModify" assignTo="{!rowToModify}"/>
                            </apex:commandLink>
                            <apex:commandLink value="Ok" style="color:red" action="{!disAllowEditForLidRow}" reRender="legalIdHead" rendered="{!legalIdRow['doEdit']}">                             
                                <apex:param value="{!rowNum}" name="rowToModify" assignTo="{!rowToModify}"/>
                            </apex:commandLink>
                            |&nbsp;
                            <apex:commandLink value="Remove" style="color:red" action="{!removeRowFromLidList}" reRender="legalIdHead" rendered="{!rowNum >= 0}">
                                <apex:param value="{!rowNum}" name="rowToModify" assignTo="{!rowToModify}"/>
                            </apex:commandLink>                        
                            <apex:variable var="rowNum" value="{!rowNum + 1}"/>
                        </apex:column>
                    </apex:pageBlockTable>
                    <apex:outputPanel rendered="{! $User.UIThemeDisplayed == 'Theme3' }">
                    	<apex:commandButton action="{!addNewRowToLidRowList}" value="New Row"/>
                    	<apex:commandLink value="Save" action="{!save}" oncomplete="" target="_parent" styleClass="btn" style="text-decoration:none;padding:4px;"/>
                    </apex:outputPanel>
                    <apex:outputPanel rendered="{! $User.UIThemeDisplayed == 'Theme4d' }">
                    	<apex:commandButton action="{!addNewRowToLidRowList}" value="New Row"/>
                    	<apex:commandLink value="Lightning Save" action="{!saveLightning}" rerender="none" oncomplete="doLightningRefresh()" styleClass="btn" style="text-decoration:none;padding:4px;"/>
                    </apex:outputPanel>
                </apex:pageBlockSection>
            </apex:outputPanel>
        </apex:pageBlock>    
    </apex:form>
</apex:page>

Here is the save method in the controller:
 

public PageReference save() {
        
        String legalIdString = '';
        
        for( LegalIdRow row : legalIdRowList ) {
            
            if( ( row.legalIdType != null && !row.legalIdType.equals('') )
               && ( row.legalIdValue != null && !row.legalIdValue.equals('') ) ) {
            
                   legalIdString += row.legalIdType + ':' + row.legalIdValue + ';';
               }
        }
        
        account.Legal_Identifiers__c = legalIdString;
       
        update account;
        
        return new PageReference( '/' + account.Id );
         
    }

The problem is, this is not going to work if the user is using lightning experience, because LEX doesn't support PageReference and I'm having to use apex:inputvalue for my form. Is there a simple way to do this in both Classic and Lightning? I've been digging around all day and haven't found anything. I thought I could add an oncomplete attribute to the command link and then use the sforce.one object to redirect to the detail page, but it looks like the save action redirects automatically.