Complex sentence: Baronius' exclusion by Avila led to a clash with Aldobrandini, with both cardinals yelling at the other that they would be willing to make the conclave last over a year in order to elect their respective candidates.
Split into simpler sentences: Baronius' exclusion by Avila led to a clash with Aldobrandini. Both cardinals began yelling at the other that they would be willing to make the conclave last over a year in order to elect their respective candidates.