Complex sentence: The city of Philadelphia has placed four bids for the Olympics in 1920,1948,1952 and 1956, losing all their bids and having also pulled their bids another three times for the 2004,2016 and 2024 games.
Split into simpler sentences: The city of Philadelphia have placed four bids for the Olympics in 1920,1948,1952,1956. Losing all and having pulled there bids another three times for the 2004,2016 and 2024 games.