Complex sentence: Missing out on a trend of promoting women's football, Hertha was one of a diminishing number of major German football clubs left outside the top of women's football, but in 2009, it was announced that Hertha BSC was to launch a cooperation with 1.
Split into simpler sentences: Missing out on a trend of promoting women's football, Hertha became one of a decreasing number of major German football clubs left outside the top of women's football. But in 2009, it was announced that Hertha BSC was to launch a cooperation with 1.