Complex sentence: Milk contains whey protein and hormones such as bovine IGF-1 and precursors of dihydrotestosterone, which are hypothesized to promote the effects of insulin and IGF-1 and thereby increase the production of androgen hormones, sebum, and promote the formation of comedones.
Split into simpler sentences: Milk contains whey protein and hormones such as bovine IGF-1 and precursors of dihydrotestosterone. These milk components are hypothesized to promote the effects of insulin and IGF-1 and thereby increase the production of androgen hormones, sebum, and promote the formation of comedones.