As you recall water is split during photosynthesis and the hydrogen produced combines with carbon dioxide to form reduced carbon of sugar, and the hydroxyl group is converted 
(you; recall; ) (the hydroxyl group; is converted; ) (water; is split; T:during photosynthesis) (the hydrogen; produced; combines with carbon dioxide)
you the hydroxyl group water the hydrogen
recall is converted is split produced
T:during photosynthesis
combines with carbon dioxide