i am so confused right now , they both look the same to me
as far as i understand past perfect is used to talk about an action that was completed before some point in the past
"i had had breakfast then went to school" looks fine to me
but : "i had breakfast then went to school" also looks fine to me because the sentence self explains itself because of the "then" placed at the middle of the sentence , the listener can easily notice which action happened first
When should i use Past Simple + Past Simple and when to use Past Perfect + Past Simple ?
thanks in advance.