`<script>
        function complete1() {
           RedirectAccount();
            }
     </script>
<apex:commandButton value="Update all Contacts" action="{!updateContacts}" rendered="{!IF(accList.size!=null, true, false)}"  oncomplete="complete1();" >
   <apex:actionfunction name="RedirectAccount" action="{!RedirectAccount}"/>
         </apex:commandButton>
   <apex:messages />`

`public void cloneRec()
{
    List<Contact> lstContact = [SELECT Accountid  FROM Contact WHERE Splits__c=true];
    if(lstContact.size()>0){
    ID AccSel=lstContact[0].Accountid;
    system.debug('AccSel '+AccSel);
    Account acc = [SELECT Id,Name FROM Account WHERE Id =:AccSel];
    accClone = acc.clone(false,true,false,false);

     List<Account> CheckAcc =[SELECT id, (SELECT Splits__c FROM Contacts) FROM Account WHERE id IN (SELECT AccountId FROM Contact  WHERE Splits__c=true)];

     if(CheckAcc.size()>1){
     ApexPages.addmessage(new ApexPages.message(ApexPages.severity.WARNING,'No splitting'));
     system.debug('CheckAcc.size() '+ CheckAcc.size());
     }Else{
            insert accClone;
            IsMade = '1';
            accClone.Name = 'TESTCLONE' + accClone.Name;
            update accClone;
            idOfRecNew = accClone.id;
            List<Contact> cons = new List<Contact>();
            List<Contact> con = [SELECT Id,firstname, LastName, AccountId,Splits__c FROM Contact WHERE AccountId = : acc.Id AND Splits__c=true];
            for(Contact c : con)
            {
                Contact conClone = c.clone(false,true,false,false);
                conClone.AccountId = accClone.Id;
                conClone.Splits__c = false;
                cons.add(conClone);
            }
            insert cons;
            List<Contact> conOld =[SELECT id,Accountid FROM Contact WHERE Splits__c=true AND Accountid =:AccSel];
            system.debug('conOld '+conOld);
            delete conOld;
            }
    }
  }

  public PageReference RedirectAccount(){
  List<Account> CheckAcc =[SELECT id, (SELECT Splits__c FROM Contacts) FROM Account WHERE id IN (SELECT AccountId
   FROM Contact  WHERE Splits__c=true)];
  if(IsMade=='1'){
  system.debug('redirection has fired ');
  PageReference retURL = new PageReference('https://cs89.salesforce.com/'+idOfRecNew);
  retURL.setRedirect(true);
      return retURL;}
             return null;
 }`