Complex sentence: It refers to the disallowing of a goal scored by Roma versus Juventus in a crucial match valid for Serie A 1980-81 and played in the last rounds of the league when the two teams were, along with Napoli, fighting for the title.
Split into simpler sentences: It refers to the disallowing of a goal scored by Roma versus Juventus in a crucial match for the 1980-81 Serie A championship. It occurred during one of the last matches of the league season when the two teams were, along with Napoli, fighting for the title.