Complex sentence: Preston married Estelle M. Evans (1847 -?), whose father was the wealthy real estate developer Brice S. Evans, on December 6,1866, and the couple had one son, Evans (1867-1900).
Split into simpler sentences: Preston married Estelle M. Evans (1847 -?) on December 6,1866. His father-in-law was the noted real estate developer Brice S. Evans, and the couple had one son, Evans (1867-1900).