These bacteria are the 'work horses' that transform nitrogen gas into amino acids for the plant.
(These bacteria; are; the 'work horses' that transform nitrogen gas into amino acids for the plant) (the 'work horses; transform; nitrogen gas; into amino acids for the plant)
These bacteria the 'work horses
are transform
the 'work horses' that transform nitrogen gas into amino acids for the plant
nitrogen gas into amino acids for the plant