Complex sentence: Agalinis tenuifolia is 10 to 120 centimeters tall, with simple opposite leaves that are 10 to 40 millimeters long, and only 0.5 to 2 millimeters wide.
Split into simpler sentences: Agalinis tenuifolia is 10 to 120 centimeters tall. It has simple opposite leaves, which are 10 to 40 millimeters long, and only 0.5 to 2 millimeters wide.