Complex sentence: Donald Howard, 3rd Baron Strathcona and Mount Royal became its first honorary president and upon his death, he was succeeded by the Prince Arthur, Duke of Connaught and Strathearn, a former Governor-General of Canada.
Split into simpler sentences: Donald Howard, the Baron Strathcona and Mount Royal became its first honorary president and. Upon his death, he was succeeded by the Prince Arthur, the Duke of Connaught and Strathearn, a previous Governor-General of Canada.