Complex sentence: He currently plays with the progressive rock group Trans-Siberian Orchestra and with thrash metal band Metal Church until their 2009 disbanding, although he is most remembered for his drumming for the band, Savatage on their albums since "Japan Live' 94".
Split into simpler sentences: He currently plays with the progressive rock group Trans-Siberian Orchestra. He also worked with thrash metal band Metal Church until their 2009 disbanding, although he is most remembered for his drumming for Savatage on their albums since "Japan Live' 94".