Complex sentence: William began his own practice at Leamington Spa in 1831 but suffered bankruptcy in 1837 and emigrated with his wife and 10 children to what is now Toronto, Ontario, Canada in 1843, where his career flourished.
Split into simpler sentences: William began his own practice at Leamington Spa in 1831 but suffered bankruptcy in 1837. He emigrated with his wife and 10 children to what is now Toronto, Ontario, Canada in 1843, where his career flourished.