Complex sentence: The B-29s required runways that were almost twice the size of those for the older B-17s, and he was forced to divert his resources to construct a oil pipeline to the Matterhorn airfields.
Split into simpler sentences: The B-29s required runways that were almost twice the size of those for the older B-17s. He was also forced to divert his resources to construct a oil pipeline to the Matterhorn airfields.