Complex sentence: Though textiles continued to dominate the local economy well into the 1970s, the people of Burlington knew they could not survive on the back of a single industry, and the country's involvement in World War II brought important local economic changes.
Split into simpler sentences: Though textiles continued to dominate the local economy well into the 1970s, the people of Burlington knew they could not survive with only one industry. The country's involvement in World War II brought important local economic changes.