Complex sentence: Near the end of the recording of the EP, Katsuyuki left the band however they soon found new members Kohei Watanabe and Kei Ishida from Vomit Remnants.
Split into simpler sentences: Near the end of the recording of the EP, Katsuyuki left the band to be replaced by Kohei Watanabe. However, they soon found new members Kohei Watanabe and Kei Ishida from Vomit Remnants.