Complex sentence: On average, in adult males, levels of testosterone are about 7--8 times as great as in adult females, but, as the metabolic consumption of testosterone in males is greater, the daily production is about 20 times greater in men.
Split into simpler sentences: On average, in adult males, levels of testosterone are about 7--8 times as great as in adult females. As the metabolic consumption of testosterone in males is greater, the daily production is about 20 times greater in men.