Complex sentence: Over the course of "Buffy", Spike falls in love with the Slayer, reacquires his soul to prove himself to Buffy and dies a hero in the show's series finale before being resurrected in the fifth season of spin-off series "Angel".
Split into simpler sentences: Over the course of "Buffy", Spike falls in love with the Slayer, reacquires his soul to prove himself to Buffy and dies a hero in the show's series finale. He is subsequently resurrected in the fifth season of spin-off series "Angel".