Complex sentence: The new wave of Irish began in 1812 when James Anderson immigrated to Louisville, who not only started a successful wholesale dry good store, but also directed the Louisville branch of the Bank of the United States and joined the Louisville Commons Council.
Split into simpler sentences: The new wave of Irish began in 1812 when James Anderson immigrated to Louisville,. He started a successful wholesale dry good store and also directed the Louisville branch of the Bank of the United States and joined the Louisville Commons Council.