sentence: As the causes of the Second World War had its roots in events that were the outcome of the First War , a Third , hypothetical war , could have its roots in a past conflict that may well have happened already .
modified: As the causes of the Second World War had its roots on events that were the outcome of the First War , a Third , hypothetical war , could have its roots on a past conflict that may well have happenned already .
transformation: PREP, PREP, SPELL