Complex sentence: The Windsor Yacht Club has 71 slips (allowing vessels up to 60 feet in length) and it extends its facilities to members of reciprocal clubs including members of (DRYA) and (I-LYA) affiliated clubs.
Split into simpler sentences: The Windsor Yacht Club has 71 slips (allowing vessels up to 60 feet in length). WYC extends its facilities to members of reciprocal clubs including members of (DRYA) and (I-LYA) affiliated clubs.