Complex sentence: In addition, the Allison engine had only a single-speed supercharger, consequently, its altitude performance was much inferior to other naval fighters of the period such as the Grumman F4F Wildcat.
Split into simpler sentences: In addition, the Allison engine had only a single-speed supercharger. Consequently, its altitude performance was much inferior to other naval fighters of the period, such as the Grumman F4F Wildcat.