Complex sentence: The game coincided with the Senior Cup Final between Liverpool and Everton at Anfield, where tannoys announced before the final's conclusion, to the delight of supporters, that Sheffield United had won 2--1 and made Liverpool champions.
Split into simpler sentences: The game coincided with the Senior Cup Final between Liverpool and Everton at Anfield. Tannoys announced during the match, to the delight of supporters, that a Sheffield United win had made Liverpool champions.