Complex sentence: The day Macaulay came to hear them play he was suffering from what he described as the worst hangover of his life and the band was playing so loud and he could not judge how good they were but he decided to give them a chance.
Split into simpler sentences: The day Macaulay came to hear them play, he was suffering from what he described as the worst hangover of his life. The band was playing so loud he could not judge how good they were, but he decided to give them a chance.