Complex sentence: Throughout all this, Joey has been tracking down the missing gun, and is about to finally get it back but is foiled by the presence of Tommy, who takes him and Oleg to a hockey rink to meet Frankie and Ivan.
Split into simpler sentences: Throughout all this, Joey has been tracking down the missing gun, and is about to finally get it back. Tommy then takes Joey and Oleg to a hockey rink to meet Frankie and Ivan.