Complex sentence: Todd McFarlane had left Marvel Comics to create an independent company called Image Comics and noticed Greg's work on "X-Force" and convinced him to leave the company and do the pencilling for McFarlane's comic, "Spawn".
Split into simpler sentences: Todd McFarlane had left Marvel Comics to create an independent company called Image Comics and noticed Greg's work on "X-Force". McFarlane convinced Capullo to leave the Marvel Comics and create the pencilling for McFarlane's comic, "Spawn".