Complex sentence: She was a art dealer who exposed the artwork she sold on her yacht, the Vagrant, boat that was built by Horace Vanderbilt in 1941 and bought by the Beatles in 1966.
Split into simpler sentences: She was a art dealer who exhibited the artwork she sold on her yacht, the Vagrant. The boat was built by Horace Vanderbilt in 1941 and later bought by the Beatles in 1966.