Complex sentence: Al-Mu'tamid's father disapproved of the relationship and the influence of the vizier (not least because Ibn Ammar was a commoner) and sent him into exile in order to separate the two.
Split into simpler sentences: Al-Mu'tamid's father disapproved of the frendship bettween Ibn Ammar and Al-Mu'tamid. And the influence of the vizier (not least because Ibn Ammar was a commoner) and sent him into exile in order to separate the two.