Complex sentence: The engine was produced in two types the E and B series both are essentially the same, the B4E was available in a trainer version with a front exhaust collector "ring" for use without cylinder air baffles.
Split into simpler sentences: The engine was produced in two types, the E and B series; both are essentially the same. The B4E was available in a trainer version with a front exhaust collector "ring" for use without cylinder air baffles.