Complex sentence: The EC 725 was developed to meet a French Air Force requirement for a specialist helicopter for Combat Search & Rescue operations after the AS 532 A2 Cougar model was rejected for this purpose following extensive trials between 1996 and 1999.
Split into simpler sentences: The EC 725 was developed to meet a French Air Force requirement for a specialist helicopter for Combat Search & Rescue operations. The AS 532 A2 Cougar model was examined and rejected for this purpose following extensive trials between 1996 and 1999.