story: Nicole loved to write by an oil lamp at night. But it was messy to change the oil and the wick. When she had to do so, it was a challenge. She'd bring rags to protect the table. But when everything was ready, she could enjoy a nice light.
 selected sentence: When she had to do so, it was a challenge.
Nicole writes by an oil lamp at night >Causes/Enables> Nicole changes the oil and wick of the oil lamp