Complex sentence: Horace Henry Hart (1840--1916) was an English printer and biographer, best known as the author of "Hart's Rules for Compositors and Readers", first issued (as a single sheet for in-house use) in 1893.
Split into simpler sentences: Horace Henry Hart (1840--1916) was an English printer and biographer. He was the author of "Hart's Rules for Compositors and Readers", first issued in 1893.