Complex sentence: He subsequently had to relearn even the most basic motor skills such as swallowing and talking-as such he has had to fight his way to the top of world skiing twice (having had to completely re-learn how to ski after his accident).
Split into simpler sentences: He subsequently had to relearn even the most basic motor skills such as swallowing and talking. As such he has had to fight his way to the top of the world of skiing twice (having had to completely re-learn how to ski after his accident).