Complex sentence: The museum also operates a small group of flying historic aircraft, such as the Piedmont Airlines' DC-3, and two Grumman OV-1D Mohawks, which attend air shows along the east coast.
Split into simpler sentences: The museum also operates a small group of flying historic aircraft. These include the DC-3 in the representative markings of Piedmont Airlines', and two Grumman OV-1D Mohawks, which attend air shows along the east coast.