Complex sentence: Williams and Guion was formed by John Stanton Williams (c1810-1776) and Stephen Baker Guion (1820-1885), who relocated to Liverpool in 1852 as the firm's agent while Williams remained in New York.
Split into simpler sentences: Williams and Guion was formed by John S. Williams (c1810-1776) and Stephen B. Guion (1820-1885). Guion relocated to Liverpool in 1852 as the firm's agent while Williams remained in New York.