Complex sentence: Today, remnants of the wave machine can be observed on the south end of Beachcomber Isle which faces the present-day Disney's Wedding Pavilion which sits upon a section of the original sloped underwater basin, graded to allow for breaking waves.
Split into simpler sentences: Today, remnants of the wave machine can be observed on the south end of Beachcomber Isle which faces the present-day Disney's Wedding Pavilion. In fact, the wedding pavilion is built upon a section of the original sloped underwater basin which was graded to allow for breaking waves.