Complex sentence: Square rigged vessels ranged in size from small boats to full rigged ships, however, today the rig in common use is a form of fore-and-aft gaff rigs and bermuda rigs.
Split into simpler sentences: Square rigged vessels range in size from small boats to full rigged ships. However even for the largest vessels, the rig has been largely replaced by fore-and-aft gaff rigs and bermuda rigs.