Complex sentence: An electric grand piano is a particular type of piano manufactured and marketed by Yamaha, Kawai and Helpinstill during the 1970s and 1980s, although experimental instruments of similar type were made as early as the late 1920s.
Split into simpler sentences: An electric grand piano is a particular type of piano manufactured and marketed by Yamaha, Kawai and Helpinstill during the 1970s and 1980s. Although experimental instruments of similar type were made as early as the late 1920s.