Complex sentence: Even at the age of thirty, he used to attend the special assemblies held at Dār’un Nadwa, the residence owned by Ḥakīm ibn Ḥizām, although the rule of age of entry to these private assemblies was at least forty.
Split into simpler sentences: Even at the age of thirty, he used to attend the special assemblies held at Dār’un Nadwa, the residence owned by Ḥakīm ibn Ḥizām. Yet, the rule of age of entry to these private assemblies was at least forty.