Complex sentence: The first two, commonly referred to as the "Two Sahihs" as an indication of their authenticity, contain approximately seven thousand ahadith altogether if repetitions are not counted, according to Ibn Hajar.
Split into simpler sentences: The first two are referred to as the "Two Sahihs" as an indication of their authenticity. Combined the "Two Sahihs" contain approximately seven thousand ahadith if repetitions are not counted, according to Ibn Hajar.