Complex sentence: Michelle's circus-themed birthday party features clowns, an elephant, balloons, a cake... but no birthday girl because Michelle went with Jesse and Stephanie to the gas station but it closes while they are still in there.
Split into simpler sentences: Michelle's circus-themed birthday party features clowns, an elephant, balloons, a cake... but no birthday girl! Because Michelle went with Jesse and Stephanie to the gas station but it closes while they are still in there.