Complex sentence: The Hunetr Medina 20 was designed by David Thomas for Hunter boats in 1979 as a fast lifting keel trailer-sailer, based on the designs of the highly successful Hunter Sonata.
Split into simpler sentences: The Hunetr Medina 20 was designed by David Thomas for Hunter boats in 1979. The Medina 20 was a fast lifting keel trailer-sailer, based on the designs of the highly successful Hunter Sonata.