Complex sentence: Several Qur'anic verses state that some revelations have been abrogated and substituted by later revelations, which are understood by most Muslim scholars as pertaining to the verses of the Quran itself.
Split into simpler sentences: Several Qur'anic verses state that some revelations have been abrogated and substituted by later revelations. Which are understood by most Muslim scholars as pertaining to the verses of the Quran itself.