Complex sentence: In American production, the DH.4 proved suitable for the new Liberty engine-although this produced a slightly inferior performance to the Eagle it was also to eventually power the British DH.9A.
Split into simpler sentences: In American production, the new Liberty engine proved suitable as a DH.4 powerplant although the engine produced a slightly inferior performance to the Eagle. The Liberty was also to eventually power the British DH.9A.