Complex sentence: After the Portuguese Federation started it's functions and after the national team played it's first game, it was decided that a nation-wide football competition was needed and would be played and the winner would be classified as the Portuguese Champion.
Split into simpler sentences: After the Portuguese Federation started it's functions and after the national team played it's first game, it was decided that a nation-wide football competition was needed. It would be played and the winner would be classified as the Portuguese Champion.