Complex sentence: Al-Alwan's mosque in Al-Qassim Province was criticised by moderate Islamic clerics as a "terrorist factory", among his students was Abdulaziz al-Omari, one of the plane hijackers in the September 11 attacks.
Split into simpler sentences: Al-Alwan's mosque in Al-Qassim Province was criticised by moderate Islamic clerics as a "terrorist factory". Among his students was Abdulaziz al-Omari, one of the plane hijackers in the September 11 attacks.