As he listened to the haunting notes of the song the author realized he had found the inspiration for his next suspense novel. The teacher reviewing this sentence would point out that since this is a

complex sentence, there should be a comma after “song.”
compound sentence, there should be a comma after “realized.”
complex sentence, there should be a comma after “inspiration.”
compound sentence, there should be a comma after “found.”

it would most likely be b. your welcome.

in june, we will have been married for eighteen months. (i am assuming this is what you want? the sentence, as you have presented it, is grammatically incorrect--   you want it corrected, yes? )

i literally just read the book and studied it for months so i could you, but i need to know where these questions are coming from. they are too general.

may i see the historical information and the excerpt?