Complex sentence: UV-18A is the US military designation for de Havilland Canada DHC-6 Twin Otter, and it has been replaced by C-23 Sherpa, the military versions of Shorts 330 and Shorts 360.
Split into simpler sentences: UV-18A is the US military designation for De Havilland Canada DHC-6 Twin Otter. It has been replaced by C-23 Sherpa, the military versions of Shorts 330 and Shorts 360.