Complex sentence: While he is getting ready, Peter trips on Stewie's time machine, destroying it and injuring his leg, thus preventing him from taking Chris to his soccer match, while Stewie is left to suffer with more teething pain.
Split into simpler sentences: While he is getting ready, Peter trips on Stewie's time machine, destroying it and injuring his leg, thus preventing him from taking Chris to his soccer match. And Stewie is left to suffer with more teething pain.