فَجَعَلَهُۥ غُثَآءً أَحْوَىٰ
Sentence structure
فَجَعَلَهُۥ is coordinated with the preceding verb: its understood subject is هُوَ and attached هُۥ is the first object. غُثَآءً is the second object; أَحْوَىٰ is read here as its accusative adjective.
Ayah summary
Then He turns that pasture into dry, dark stubble.
فَجَعَلَهُۥ — And then makes it
Grammar: فَ coordinates; جَعَلَ is a third-person masculine-singular perfect with understood subject هُوَ. Attached هُۥ is its first object.
غُثَآءً — stubble
Grammar: An indefinite masculine-singular accusative noun functioning as the second object of جَعَلَ.
أَحْوَىٰ — dark
Grammar: In one grammatical reading, an indefinite masculine-singular accusative adjective of غُثَآءً, with an estimated fatḥah on the final alif.