Complex sentence: At the beginning of season 3, she was in a long-distance relationship with a boy she met in Wyoming, but she did go to her prom with a classmate who everyone but himself knows is gay.
Split into simpler sentences: At the beginning of Season 3, she was in a long-distance relationship with a boy she met in Wyoming. Later in the season she went to her prom with a classmate who everyone but himself knows is gay.