Complex sentence: Cape Schanck was named after Lt John Schanck of the Royal Navy famous for designing the raised keel (or centreboard) used on naval vessels so as to allow navigation in shallow waters.
Split into simpler sentences: Cape Schanck was named after Lt John Schanck of the Royal Navy. His claim to fame was the design of the raised keel (or centreboard) used on naval vessels to allow navigation in shallow waters.