Complex sentence: During World War II, the state became a focus for war industries, with the Boeing Company producing many of the nation's heavy bombers and ports in Seattle, Bremerton, Vancouver, and Tacoma were available for the manufacture of warships.
Split into simpler sentences: During World War II, the state became a focus for war industries. With the Boeing Company producing many of the nation's heavy bombers and ports in Seattle, Bremerton, Vancouver, and Tacoma were available for the manufacture of warships.