Complex sentence: The Second Bank of the United States was chartered five years after the First Bank of the United States lost its charter, also for 20 years; the bank was created to finance the country in the aftermath of the War of 1812.
Split into simpler sentences: The Second Bank of the United States was chartered five years after the First Bank of the United States lost its charter. The bank was created to finance the country in the aftermath of the War of 1812.