Complex sentence: Joey and Oleg run into Lester, the new owner of the gun and a struggle between Joey and Lester develops that ends with Lester shooting Joey with the gun but not before Joey stabs Lester in the neck with his own knife.
Split into simpler sentences: Joey and Oleg run into Lester, the new owner of the gun, and a struggle between Joey and Lester develops. It ends with Lester shooting Joey with the gun, but not before Joey stabs Lester in the neck with his own knife.