Complex sentence: Andrew Young (1807--1889), author of "There Is a Happy Land", schoolmaster and poet, second son of David Young, teacher in Edinburgh, was born at Edinburgh on 23 April 1807.
Split into simpler sentences: Andrew Young (1807--1889) was a Scottish schoolmaster and poet, known as the author of the hymn There Is a Happy Land. The second son of David Young, a teacher in Edinburgh, was born at Edinburgh on 23 April 1807.