Complex sentence: Thorn leaves without Fone Bone by facing an army head on, and flying over them, forcing Fone Bone to grab Bratleby's stomach fur again when the army sees him.
Split into simpler sentences: Thorn leaves without Fone Bone by facing an army head on, and flying over them. Forcing Fone Bone to having to grab Bratleby's stomach fur again when the army sees him.