Complex sentence: A third batch of Gripens was ordered in June 1997, composed of 50 upgraded single-seat JAS 39Cs and 14 JAS 39D two-seaters.
Split into simpler sentences: A third batch of Gripens was ordered in June 1997. This batch called for 50 upgraded single-seat JAS 39Cs and 14 JAS 39D two-seaters.