Complex sentence: DHT is synthesized in the prostate gland, testes, hair follicles, and adrenal glands by 5α-reductase, this enzyme reduces the 4,5 double-bond of the hormone testosterone.
Split into simpler sentences: DHT is synthesized primarily in the prostate gland, testes, hair follicles, and adrenal glands by the enzyme 5α-reductase. This enzyme reduces the 4,5 double-bond of the hormone testosterone.