Complex sentence: Modern catamarans are rigid and put up with greater forces and strain in the waves, whereas on Wharrams the beams are lashed to the hulls with linen latches or belts, in true Polynesian style.
Split into simpler sentences: Modern catamarans are rigid and put up with greater forces and strain in the waves. Wharrams are built with linen latches or belts, in true Polynesian style.