Complex sentence: A similar vehicle was also built in conjunction with the T92, the T93 Gun Motor Carriage which mounted the longer 8-inch (203 mm) M1 gun instead of the 240mm howitzer.
Split into simpler sentences: A similar vehicle was also built in conjunction with the T92, the 8in Gun Motor Carriage T93. The T93 mounted the longer 8in M1 gun instead of the 240mm howitzer.