Complex sentence: Samuel Tyler Lawrence (November 21,1786--December 18,1847) was resident of New York in the 1820s who was an early associate of Joseph Smith, the founder of the Latter-day Saint movement.
Split into simpler sentences: Samuel Tyler Lawrence (21 November 1786-18 December 1847) was resident of New York in the 1820s. Lawrence was an early associate of Joseph Smith, the founder of the Latter-day Saint movement.