إِنَّ سَعْيَكُمْ لَشَتَّىٰ
Sentence structure
إِنَّ governs سَعْيَكُمْ as its accusative noun. Emphatic لَ precedes the nominative predicate شَتَّىٰ.
Ayah summary
Surely your efforts are diverse and opposed to one another.
إِنَّ — Indeed
Grammar: An emphatic particle that makes its noun accusative and predicate nominative.
سَعْيَكُمْ — your efforts
Grammar: A masculine accusative noun of إِنَّ; attached كُمْ is the masculine-plural possessor.
لَشَتَّىٰ — are surely diverse
Grammar: Emphatic لَ precedes the nominative predicate شَتَّىٰ.