Complex sentence: It is also likely that the crusaders were motivated by a need for money, and the Rhineland communities were relatively wealthy, both due to their isolation, and because they were not restricted as Christians were against moneylending.
Split into simpler sentences: It is also likely that the crusaders were motivated by their need for money. The Rhineland communities were relatively wealthy, both due to their isolation, and because they were not restricted as Christians were against moneylending.