Complex sentence: She became a friend and later girlfriend of Army Private Steve Rogers, unaware of his dual identity as Captain America.Following the empowering of Captain America, Betty sinvestigated fortune tellers Sando and Omar and exposed them as spies with the aid of Captain America and Bucky.
Split into simpler sentences: She became a friend and eventual girlfriend of Army Private Steve Rogers, unaware of his dual identity as Captain America. Betsy investigated fortune tellers Sando and Omar and exposed them as spies with the aid of Captain America and Bucky.