Complex sentence: Simon spoke for Newfoundland in a boundary dispute with Canada, before announcing his permanent retirement from the Bar, then from 1927 to 1931 he chaired the Simon Commission on India's constitution.
Split into simpler sentences: Simon spoke for Newfoundland in a boundary dispute with Canada, before announcing his permanent retirement from the Bar. From 1927 to 1931 he chaired the Simon Commission on India's constitution.