Complex sentence: The highly agile two seat fighters with their rear firing gun turrets that equipped the Schlastas were no easy target for an Entente fighter pilot nor were the armoured aircraft and the Junkers J.I in particular acquired a reputation for being almost impossible to shoot down.
Split into simpler sentences: The highly agile two seat fighters with their rear firing gun turrets that equipped the Schlastas were no easy target for an Entente fighter pilot nor were the armoured aircraft. The Junkers J.I in particular acquired a reputation for being almost impossible to shoot down.