Complex sentence: In 1842 Arthur Albright, a trained chemist, became a Partner in the Birmingham chemical firm of John and Edmund Sturge; his sister had married Edmund Sturge who was also a Quaker.
Split into simpler sentences: In 1842 Arthur Albright became a Partner in the Birmingham chemical firm of John and Edmund Sturge. His sister had married Edmund Sturge, who was also a Quaker.