Assalamun alaikum

I tried to this analyis this sentence..

Bismillahir Rahmanir Raheem

Bismi - Jarar Majroor +

ismi - Mudaf

Allahi - Mudaf ilahi + mawsoof

ArRahmaani - Sifah 1

ArRaheem - Sifah 2

This is the correct anaysis ..

Normal it is mubtadah and khabar but here jarur majroor is brought forward..why what is the reason for it.

I am learning arabic on youtube the madina books..

Jazak-Allah for your help