Complex sentence: His father sent him to school to study secular knowledge during the day, and in the evening he studied Islam at the local "maktab", where he learned the basics of Islamic law, jurisprudence, the "hadith" and Qur'anic exegesis.
Split into simpler sentences: His father sent him to school to study secular knowledge during the day, followed by the evening in which he studied Islam at the local "maktab". This is where he would learn the basics of Islamic law, jurisprudence, the "hadith" and Qur'anic exegesis.