Complex sentence: Following that they were 3rd in Sectrion A of the Spartan League in 1909-10 and 3rd in the South Suburban West League in 1910-11, before becoming South Suburban Champions in the 1911-12 season.
Split into simpler sentences: Following that they were 3rd in Sectrion A of the Spartan League in 1909-10. They then finished 3rd in the South Suburban West League in 1910-11, before becoming South Suburban Champions in the 1911-12 season.