A. L. R. (This is) a Book, with verses basic or fundamental (of established meaning), further explained in detail,- from One Who is Wise and Well-acquainted (with all things):
Every basic principle is included in Allah’s Revelation,
and it is further illustrated and explained in detail.
Also see the post:
Yusuf Ali, Abdullah. Translation and Commentary of the Quran. (surah 11 verse 1). Microsoft Word – 011 Hud.doc (quran4u.com)