Complex sentence: On the first day, five hundred men were encamped in the city; within a week, more than 12,000 recruits had signed up to fight for the Union, nearly three times as many needed to meet the state's initial quota.
Split into simpler sentences: On the first day, five hundred men were encamped in the city. Within a week, more than 12,000 recruits had signed up to fight for the Union, nearly three times as many needed to meet the state's initial quota.