Complex sentence: Then, after practising a cheerful routine to show the world, she heads out to the store to buy some vegetables for her roast from the grocer so she can form an alibi for the crime.
Split into simpler sentences: Then, after practising a cheerful routine to show the world, she heads out to the store to buy some vegetables for her roast from the Grocer. This is so she can form an alibi for the crime.