Complex sentence: On the Gunk Dunk, Mr. Blobby was reading the questions and if Dave answered one of them correctly, they would let him go, but because he could only say'Blobby', Dave got all the questions wrong and was thrown in the gunge pool.
Split into simpler sentences: On the Gunk Dunk, Mr. Blobby was reading the questions and if Dave answered one of them correctly, they would let him go. Because Mr Blobby could only say'Blobby' Dave got all the questions wrong and was thrown in the gunge pool.