Complex sentence: The post-war period led to a slow but steady decline, which was partially inflicted by the lack of funds to buy more competitive players, and eventually culminated into the first brief relegation from the top tier after forty years in 1960.
Split into simpler sentences: The post-war period led to a slow, but steady decline due to lack of funds to buy more competitive players. It eventually culminated into the first brief relegation from the top tier after forty years in 1960.