Complex sentence: Goofy begins with "In the Good Old Summer Time" and moves on to "There'll Be a Hot Time in the Old Town Tonight", but the tempo and intensity of the song causes the machine to explode.
Split into simpler sentences: Goofy begins with "In the Good Old Summer Time" and moves on to "There'll Be a Hot Time in the Old Town Tonight". But the tempo and intensity of the song causes the machine to explode.