Complex sentence: The Winged Keel is a sailboat keel originally adopted by Ben Lexcen and made its first appearance on the America's Cup winning 12-metre class yacht "Australia II" in the 1983 America's Cup.
Split into simpler sentences: The winged keel is a sailboat keel originally adopted by Ben Lexcen. It made its first appearance on the America's Cup winning 12-metre class yacht "Australia II" in the 1983 America's Cup.