Leibniz defines monads as simple substances with no parts (Monadology, 1). Later on, we learn that some of those are souls which have memory (Monadology 19) and further others are rational souls having knowledge of necessary truths (Monadology 29). But the souls and rational souls are -as far as I understand- kinds of monads, i.e. they too are simple substances without parts. How would Leibniz explain a simple substance having higher capabilities than another?
Similarly, on article 48 Leibniz states that, analogous to God's power, knowledge and will, the monads consist of the subject, the faculty of perception and the appetitive faculty. How would Leibniz explain the simplicity of a monad with two distinct faculties?
Thanks in advance.