Complex sentence: In 1874 he began to manufacture porcelain enamelware made of cast iron coated with ceramic glaze, and in 1884 founded the Jacob J. Vollrath Manufacturing Company, which grew steadily under his leadership and which he headed until his death in 1898.
Split into simpler sentences: In 1874 he began to manufacture porcelain enamelware made of cast iron coated with ceramic glaze. In 1884 founded the Jacob J. Vollrath Manufacturing Company, which grew steadily under his leadership and which he headed until his death in 1898.