Complex sentence: In 1827, he married his 16-year old cousin Frances Elizabeth Chivers, though the two separated due to alleged meddling by Frances Chivers Albert, the wife of the poet's uncle, prior to the birth of their daughter in 1828.
Split into simpler sentences: In 1827, he married his 16-year old cousin Frances Elizabeth Chivers. The two soon separated due to alleged meddling by Frances Chivers Albert, the wife of the poet's uncle, prior to the birth of their daughter in 1828.