Complex sentence: The Navy also attempted to established a naval air service, composed of fighter jets, but this proved impossible due to budgetary constraints and the opposition of the Air Force, which was reluctant to risk and lose its aircraft in open-sea operations.
Split into simpler sentences: The Navy also attempted to established a naval air service, composing of fighter jets, but this was impossible to achieve. The lack of funds and the air force itself objected the plans fearing to risk and lose its aircraft in open-sea operations.