Complex sentence: Dos Santos was soon invited to join an MMA practice, where he met his boxing coach Luiz Carlos Dórea, and roughly a year after he started training jiu-jitsu, he made his debut professional fight.
Split into simpler sentences: Dos Santos was soon invited to join an MMA practice, where he met his boxing coach Luiz Carlos Dórea. Roughly a year after he started training jiu-jitsu he had his debut professional fight.