Complex sentence: The fundus glands (or fundic glands, or gastric glands) are found in the body and fundus of the stomach; they are simple tubes, two or more of which open into a single duct.
Split into simpler sentences: The fundus glands (or fundic glands, or gastric glands) are found in the body and fundus of the stomach. They are simple tubes, two or more of which open into a single duct.