Complex sentence: Resveratrol (3,5,4'-trihydroxy- "trans"-stilbene) is a stilbenoid, a type of natural phenol, and a phytoalexin produced naturally by several plants in response to injury or when the plant is under attack by pathogens such as bacteria or fungi.
Split into simpler sentences: Resveratrol (3,5,4'-trihydroxy- "trans"-stilbene) is produced in response to injury. It is a stilbenoid, a type of natural phenol, and a phytoalexin produced naturally by several plants when under attack by pathogens such as bacteria or fungi.