Simplify the following text for a Grade 4 native English-speaking person.
Original: Crater is identified with a story from Greek mythology in which a crow or raven serves Apollo , and is sent to fetch water , but it rests lazily on the journey , and after finally obtaining the water in a cup , takes back a water snake as an excuse .
Simplified: It is sent to get water , but it rests lazily on the journey . After finally getting the water in a cup , it takes back a water snake as well , as an excuse .