Complex sentence: Tom Nook has made several minor appearances in the "Super Smash Bros." series of video games; appearing as various collectibles in "Super Smash Bros. Melee" and "Super Smash Bros. Brawl".
Split into simpler sentences: Tom Nook has made several minor appearances in the "Super Smash Bros." series of video games. He appears as various collectibles in "Super Smash Bros. Melee" and "Super Smash Bros. Brawl".