Complex sentence: Because mesterolone is not 17α-alkylated, it has little or no potential for hepatotoxicity, although its risk of deleterious effects on the cardiovascular system is comparable to those of several other oral AAS.
Split into simpler sentences: Because mesterolone is not 17α-alkylated, it has little or no potential for hepatotoxicity. However, its risk of deleterious effects on the cardiovascular system is comparable to that of several other oral AAS.