Complex sentence: Through British mediation, two rulers were appointed from the Al Said clan; one, distinctly for the interior (influenced by the Imam of Oman) and the other for the Sultanate of Muscat.
Split into simpler sentences: Through British mediation, two rulers were appointed from the Al Said clan. One, distinctly for the interior of Oman (a territory that was aligned to the Imam of Oman) and the other for the Sultanate of Muscat.