Complex sentence: At its peak, the city had over 20,000 residents, and the Great Southern Lumber Company's sprawling sawmill produced up to 1,000,000 board feet (2400 m³) of lumber a day.
Split into simpler sentences: At its peak, the city had over 20,000 residents. The Great Southern Lumber Company's sprawling sawmill produced up to 1,000,000 board feet (2400 m 3) of lumber a day.