ثُمَّ ٱلسَّبِيلَ يَسَّرَهُۥ
Sentence structure
In the primary analysis, ٱلسَّبِيلَ is accusative through an omitted verb explained by يَسَّرَهُۥ; this is the construction of preoccupation (ishtighāl). The stated verb has an understood subject and هُ is its object.
Ayah summary
Then Allah made the way easy for him.
ثُمَّ — Then
Grammar: ثُمَّ is a conjunction.
ٱلسَّبِيلَ — the way
Grammar: In the primary analysis, an accusative object of an omitted verb explained by يَسَّرَهُۥ; this is ishtighāl.
يَسَّرَهُۥ — He made easy for him
Grammar: form II third-person masculine singular perfect verb. Attached هُۥ is a third-person masculine singular pronoun functioning as the object.