وَطُورِ سِينِينَ ٢
Sentence structure
وَطُورِ is coordinated as another genitive oath noun and is annexed to سِينِينَ, its genitive complement.
Ayah summary
And Allah swears by Mount Sinai.
وَطُورِ — And Mount
Grammar: وَ coordinates/oath-links; طُورِ is a masculine genitive noun annexed onward.
سِينِينَ — Sinai
Grammar: A proper noun functioning as the genitive complement of طُورِ.