Complex sentence: From 1940 until 1942 he was the Lord Mayor of Melbourne, and in 1948 he was part of a delegation that went to London to lobby at the 1948 Summer Olympics for Melbourne to host the 1956 Summer Olympics.
Split into simpler sentences: From 1940 until 1942 he was the Lord Mayor of Melbourne. In 1948 he was part of a delegation that went to London to lobby at the 1948 Summer Olympics for Melbourne to host the 1956 Summer Olympics.