Complex sentence: The company then built a high-wing version of the MH.52 to meet a French Army requirement, being to small this was developed into the MH.1521 Broussard and the company went on to build 370 Broussards mainly for the French military.
Split into simpler sentences: The company then built a high-wing version of the MH.52 to meet a French Army requirement. Being too small this was developed into the MH.1521 Broussard and the company went on to build 370 Broussards, mainly for the French military.