Complex sentence: Griffin's employers worked in the distinctive Prairie School style; the school's style is marked by horizontal lines, flat roofs with broad overhanging eaves, solid construction, craftsmanship, and discipline in the use of ornament.
Split into simpler sentences: Griffin's employers worked in the distinctive Prairie School style. The school's style is marked by horizontal lines, flat roofs with broad overhanging eaves, solid construction, craftsmanship, and discipline in the use of ornament.