Complex sentence: In 1813, the village of Sing Sing was incorporated, and in 1845, the New York State Legislature created a new town out of the northern part of what had been the Town of Mount Pleasant.
Split into simpler sentences: In 1813, the village of Sing Sing was incorporated. In 1845, the New York State Legislature created a new town out of the northern part of what had been the Town of Mount Pleasant.