Complex sentence: Yost leaves for the opening premier of the circus leaving Kit Cat to watch it over the TV and her shouting at Oliver to be quiet, only to later see Oliver unpacking a blunderbuss that he brings with him going to the circus.
Split into simpler sentences: Yost leaves for the opening premier of the Circus leaving Kit Cat to watch it over the TV and her shouting at Oliver to be quiet. Only to later see Oliver unpacking a Blunderbuss that he brings with him going to the Circus.