Complex sentence: Deciding to save the Digital World, Mikey forms his own team, the Fusion Fighters, befriending various Digimon and using his Fusion Loader to DigiFuse them to battle Bagramon's army and collect the Code Crowns.
Split into simpler sentences: Deciding to save the Digital World, Mikey forms his own team known as the Fusion Fighters. Mikey uses his Fusion Loader to DigiFuse the Digimon from the Fusion Fighter team to battle Bagramon's army and collect all the Code Crowns.