Complex sentence: The terms double-top, sandwich-top, and composite-top all refer to a relatively new way to construct the soundboard of a guitar, developed by Matthias Dammann in Germany in the late 1980s.
Split into simpler sentences: The terms double-top, sandwich-top, and composite-top all refer to a relatively new way to construct the soundboard of a guitar. The double top guitar was developed by Matthias Dammann in Germany in the late 1980s.