Original sentence: Thomas Hastings (15 October 1784–15 May 1872) was an American composer, primarily an author of hymn tunes of which the best known is Toplady for the hymn Rock of Ages
Edited sentence: Thomas Hastings (15 October 1784 – 15 May 1872) was an American composer, primarily an author of hymn tunes of which the best known is Toplady for the hymn Rock of Ages