Complex sentence: Alcoholism, for example, has been identified as a cause of dilated cardiomyopathy, as has drug and alcohol toxicity, certain infections (including Hepatitis C), and various genetic and idiopathic (i.e., unknown) causes.
Split into simpler sentences: Alcoholism, for example, has been identified as a cause of dilated cardiomyopathy, and so on. Many intrinsic cardiomyopathies now have identifiable external causes including drug and alcohol toxicity, certain infections (including Hepatitis C), and various genetic and idiopathic (i.e., unknown) causes.