Complex sentence: Charles Downing (July 9,1802--January 18,1885), American pomologist, horticulturist, and author, although not as well known to the public as his brother Andrew Jackson Downing, won a sound reputation for his creative work in pomology.
Split into simpler sentences: Charles Downing (July 9,1802--January 18,1885), was an American pomologist, horticulturist, and author. Although not as well known to the public as his brother Andrew Jackson Downing, Charles won a sound reputation for his creative work in pomology.