Complex sentence: Her father Thomas Thistlewaite, a butcher, was born in Leeds and he had married Elizabeth Wetherall and they already had a son who had been born in Wilmington, Delaware where her father had been a farmer for several years.
Split into simpler sentences: Her father Thomas Thistlewaite, a butcher, was born in Leeds and he had married Elizabeth Wetherall. They already had a son who had been born in Wilmington, Delaware where her father had been a farmer for several years.