Sentence 1: Sarah needed to go grocery shopping. 
 Sentence 3: Sarah decided she needed to go grocery shopping first 
 Sentence 4:  Sarah went grocery shopping,  then returned to her home 
 Sentence 5:  Sarah decided to take a nap since she was done grocery shopping 
 Option 1: But Sarah also wanted to take a nap. 
 Option 2: Sarah took a short nap and then went for shopping.