Complex sentence: He gained knowledge of Tafseer, Hadith, spiritualism, mysticism, metaphysics, and logic, thus completing a traditional Dars-i-Nizam course, and acquired his sanad (degree in Islamic knowledge and sciences of Hadith).
Split into simpler sentences: He gained knowledge of tafseer, Hadith, spiritualism, mysticism, metaphysics, and logic. Thus completing a traditional Dars-i-Nizam course, he acquired his "sanad" (degree in Islamic knowledge and sciences of Hadith).