Complex sentence: The N-2 was originally not to have the "Schräge Musik" armament configuration or a brake parachute, but it was then decided to fit the armament set for tactical reasons.
Split into simpler sentences: The N-2 was originally not to have the "Schräge Musik" armament configuration or a break parachute. It was then decided the configuration to fit the armament set for better tactical reasons.