story: Rick had a big pet snake in his home. When he moved to a small apartment for work, he had to get rid of her. His friend watched the snake for a year while Rick worked. When Rick returned home, he was so happy to get his snake back. The snake had grown almost a foot while he was away!
 selected sentence: When Rick returned home, he was so happy to get his snake back.
Rick has to get rid of his pet snake >Causes/Enables> Rick is happy to get his snake back