Complex sentence: While at the bus station, an angry young man with a suitcase, so big that he can't get into the lavatory and take it with him, desperately asks Allan to hold the case for him and wait.
Split into simpler sentences: While at the bus station, he meets an angry young man with a suitcase so big that he can't get into the lavatory and take it with him. He desperately asks Allan to hold the case for him and wait.