Complex sentence: Firbeck Hall was built in 1594 by William West, who made a fortune practising law and serving as an associate to Gilbert, Earl of Shrewsbury from 1580 to 1594.
Split into simpler sentences: Firbeck Hall was built in 1594 by William West. West made a fortune practicing law and serving as an associate to Gilbert, Earl of Shrewsbury from 1580 to 1594.