Complex sentence: The R. Sheppard Marble and Stone Works was Canadian monumental masonry firm active in nineteenth-century Ontario, run by R. Sheppard Marble, a descendant of English settlers originally from Cheshire.
Split into simpler sentences: The R. Sheppard Marble and Stone Works was a Canadian monumental masonry firm active in nineteenth-century Ontario. It was run by R. Sheppard Marble, a descendant of English settlers, originally from Cheshire.