Complex sentence: It is metabolised mostly via CYP2D6, CYP3A4, CYP2C9-mediated N-demethylation into nortriptyline, which is another tricyclic antidepressant in its own right.
Split into simpler sentences: It is metabolised mostly via CYP2D6, CYP3A4, CYP2C9-mediated N-demethylation into nortriptyline. Although other mechanisms such as hydroxylation, N-oxidation, etc. which is another tricyclic antidepressant in its own right.