Map<Legitimation__c, List<ChecklistTemplate__c>> ligitimatCheckListTemplate = new Map<Legitimation__c, List<ChecklistTemplate__c>>();

    for (Legitimation__c eachLegitimation : newLegitimations) {

        String legalStructure = legalStructAccount.get(eachLegitimation.Account__c).LegalStructure__c;
        ligitimatCheckListTemplate.put(eachLegitimation, [SELECT Name FROM ChecklistTemplate__c WHERE Entity__c ='legitimation' AND LegalStrucure__c includes (:legalStructure)]);
   }


    for (Legitimation__c eachLegitimationKey : ligitimatCheckListTemplate.keyset()){
         for (ChecklistTemplate__c eachChecklistTemplate : ligitimatCheckListTemplate.get(eachLegitimationKey)){
            Checklist__c checkList = new Checklist__c(
                Name = eachChecklistTemplate.Name,
                TemplateId__c = eachChecklistTemplate.Id,
                LegitimationId__c = eachLegitimationKey.Id
            );
            newCheckLists.add(checkList);
        }
    }

insert newCheckLists;
}