Complex sentence: Charlie Brown's beagle Snoopy frequently daydreams of being a World War I flying ace, piloted his dog house like a Sopwith Camel, and carried a personal grudge against the Red Baron.
Split into simpler sentences: Charlie Brown's beagle Snoopy frequently fantasized about being a World War I flying ace. In his daydreams, he imagined his dog house to be a Sopwith Camel and carried a personal grudge against the Red Baron.