Complex sentence: She also rejects Curtius' claim that a Great King having a male lover was an innovation, noting that Bagoas had been a concubine of Darius III before he was the beloved of Alexander.
Split into simpler sentences: She also rejects Curtius' claim that a Great King having a male lover was an innovation. After all, Bagoas had been a concubine of Darius III before he was the beloved of Alexander.