Complex sentence: In 1813 he started business on his own account at Eyam as a currier, but trade was neglected for music, poetry, and mathematics, and his prospects were not improved when in 1816 he ran away with and married Frances Ibbotson of Hathersage.
Split into simpler sentences: In 1813 he started business at Eyam as a currier, but trade was neglected for music, poetry, and mathematics. His prospects were not improved when in 1816 he ran away with and married Frances Ibbotson of Hathersage.