Which of the sentences below are grammatically correct?

(1) The couple had been engaged for five years when they married.

(2) The couple had been engaged for five years when they were married.

(3) The couple had been engaged for five years when they had married.

Only (1) sounds correct to me, but I am unable to explain why (2) and (3) are grammatically wrong.

Which of the sentences below are grammatically correct?

1. The couple had been engaged for five years when they married. 2. The couple had been engaged for five years when they were married. 3. The couple had been engaged for five years when they had married.

Only (1) sounds correct to me, but I am unable to explain why (2) and (3) are grammatically wrong.

Which of the two sentences below is grammatically correct?

(1) The couple had been engaged for five years when they were married (2) The couple had been engaged for five years when they had married

Which of the sentences below are grammatically correct?

(1) The couple had been engaged for five years when they married.

(2) The couple had been engaged for five years when they were married.

(3) The couple had been engaged for five years when they had married.

Only (1) sounds correct to me, but I am unable to explain why (2) and (3) are grammatically wrong.

Please help to correct the grammar in the sentences below:

(1) The couple have been engaged since the summer – they are still engaged now; used 'have' instead of 'has' considering the word couple as plural.

(2) The couple had been engaged for five years when they were married — used 'had been' to indicate the state of being before another event (marriage) in the past; not sure if use of words "were married" is grammatically correct in this sentence. Should it be "had married"?

(3) The couple had been engaged for five years before they got married – same meaning as (2) but used simple past (got married)

(4) The couple had been engaged for five years before they married last year – same meaning as (2) but used simple past with time (last year)

(5) Kate Winslet has been married to James Threapleton (left) and to director Sam Mendes (right) (Reuters) – this is a caption in a news article. Why was present perfect used when she is no longer married to those people now?

Which of the two sentences below is grammatically correct?

(1) The couple had been engaged for five years when they were married  (2) The couple had been engaged for five years when they had married