Complex sentence: Regarding this same verse, Qatada ibn al-Nu'man said-Truly, on Us is (to give) guidance -' This means, We will explain what is lawful and what is prohibited.
Split into simpler sentences: Regarding this same verse, Qatada ibn al-Nu'man said-Truly, on Us is (to give) guidance. This means, We will explain what is lawful and what is prohibited.