Complex sentence: Serizawa joined as a member along with Niimi Nishiki, Hirayama Gorou, Hirama Juusuke and Noguchi Kengi and so did Kondo Isami along with Hijikata Toshizo, Okita Souji, Inoue Gensaburou, Todou Heisuke, Harada Sanosuke, and Nagakura Shinpachi.
Split into simpler sentences: Serizawa joined as a member along with Niimi Nishiki, Hirayama Gorou, Hirama Juusuke and Noguchi Kengi. Also joining the group were Kondo Isami along with Hijikata Toshizo, Okita Souji, Inoue Gensaburou, Todou Heisuke, Harada Sanosuke, and Nagakura Shinpachi.