Complex sentence: The crusader army headed south along the Mediterranean coast, defeated the Muslims near Arsuf, recaptured the port city of Jaffa, and was in sight of Jerusalem, but supply problems forced them to end the crusade without taking Jerusalem.
Split into simpler sentences: The crusader army travelled south along the Mediterranean coast, defeated the Muslims near Arsuf, and recaptured the port city of Jaffa. They were near Jerusalem, but supply shortages forced them to end the crusade without taking Jerusalem.