Complex sentence: Following Ichigo's inner hollow's forced submission, both channel all their remaining power into one final attack, resulting in Byakuya's sword temporarily breaking while Ichigo uses up all his energy and falls down.
Split into simpler sentences: Following Ichigo's inner hollow's forced submission, both channel all their remaining power into one final attack. As a result, Byakuya's sword is temporarily broken when Ichigo uses up all his energy and falls down.