Complex sentence: Steve'Zetro' Souza is one of the two singers, alongside with Chuck Billy from Testament, for Dublin Death Patrol and is the lead singer in the death/thrash metal band Tenet.
Split into simpler sentences: Steve'Zetro' Souza is one of the two singers, with Chuck Billy, for the band Testament. He also sings for Dublin Death Patrol and the death/thrash metal band Tenet.