Complex sentence: He sang two evolution theme songs for "Digimon Adventure 02", called "Break Up" and "Beat Hit!" respectively.In addition, He sang the second evolution theme for "Digimon Frontier", called "The Last Element".
Split into simpler sentences: He sang two evolution theme songs for "Digimon Adventure 02", called "Break Up" and "Beat Hit!" respectively. He also sang the second evolution theme for "Digimon Frontier", called "The Last Element".