They're green plants that turn the sun's energy into food energy through photosynthesis, so that puts them on the bottom of the food chain.
(They; 're; green plants that turn the sun's energy into food energy through photosynthesis) (green plants; turn; the sun's energy; through photosynthesis) (that; puts; them; on the bottom of the food chain)
They green plants that
're turn puts
green plants that turn the sun's energy into food energy through photosynthesis
the sun's energy through photosynthesis
them on the bottom of the food chain