Complex sentence: Richard Charles Hussey (1806--1887), always referred to as R.C. Hussey, was a British architect, who was in partnership from 1835 with Thomas Rickman, whose practice he assumed in 1838, with Rickman's failing health.
Split into simpler sentences: Richard Charles Hussey, always referred to as R.C. Hussey, was a British architect. He was in partnership with Thomas Rickman from 1835, whose practice he assumed in 1838 with the latter's failing health.