Complex sentence: Later on, this program became the basis for the "Voroshilov General Staff Academy" and the Frunze Academy refocused upon combined arms ground warfare training at the tactical level.
Split into simpler sentences: Later on, this program became the basis for the Voroshilov Academy. Following the creation of the Voroshilov General Staff Academy, the Frunze Academy refocused upon combined arms ground warfare training at the tactical level.