Complex sentence: He would eventually make his debut also for NWA Main Event, starting a storyline feud with his trainer Jeff Daniels, and on June 3,2010, won his first professional wrestling championship, when he defeated Matt Boyce for the NWA Mid-American Television Championship.
Split into simpler sentences: He would eventually make his debut also for NWA Main Event, starting a feud with his trainer Jeff Daniels. On June 3,2010, Mercer won his first professional wrestling championship, when he defeated Matt Boyce for the NWA Mid-American Television Championship.