Complex sentence: He wrote Kitab al-Shamil fi "l-Sina’a al-Tibbiyya" (Comprehensive Book in the Art of Medicine) around his 30s and it comprised 300 volumes of notes but only 80 of these were published.
Split into simpler sentences: He wrote Kitab al-Shamil fi "l-Sina’a al-Tibbiyya" (Comprehensive Book in the Art of Medicine) around his 30s. It comprised 300 volumes of notes, but only 80 of these were published.