Complex sentence: He was active in the Royal Institution of Chartered Surveyors, of which he became a fellow, and became master of the livery company for the profession, the Worshipful Company of Chartered Surveyors.
Split into simpler sentences: He was active in the Royal Institution of Chartered Surveyors of which he became a fellow. He became master of the livery company for the profession, the Worshipful Company of Chartered Surveyors.