Sentence 1: Sean was always waking up with a sore neck. 
 Sentence 3: He kept seeing this ad for a great pillow on TV 
 Sentence 4:  One day he finally caved and got online to buy the pillow 
 Sentence 5:  To his relief, it helped his neck a lot 
 Given Sentence 2: Reading up on it, he realized that he needed a better pillow.