Complex sentence: Similarly, the Swedish Stridsvagn 103 was the first tank to utilize a gas turbine as a secondary, high-horsepower "sprint" engine to augment the primary piston engine's performance.
Split into simpler sentences: Similarly, the Swedish Stridsvagn 103 was the first tank to utilize a gas turbine. In this case as a secondary, high-horsepower "sprint" engine to augment the primary piston engine's performance.