Complex sentence: The cast is in search of Kramer's car in the multi-level parking garage of a shopping mall after Kramer purchases an air conditioner, as no one can remember where the car was parked.
Split into simpler sentences: The cast is in search of Kramer's car in the multi-level parking garage of a shopping mall after Kramer purchases an air conditioner. Unfortunately, no one can remember where the car was parked.