Complex sentence: He joined the Ahmadiyya Movement in 1897 and dedicated his life to the service of the movement as part of a restored and pristine Islamic faith, some Muslim scholars and jurists have considered the Ahmadiyya to be outside of mainstream Islam or even heretical.
Split into simpler sentences: He joined the Ahmadiyya Movement in 1897 and dedicated his life to the service of the movement as part of what he saw as a restored and pristine Islamic faith. Some Muslim scholars and jurists have considered the Ahmadiyya to be outside of mainstream Islam or even heretical.