Good passwords have high entropy, not "complexity that makes it hard to remember but easier to crack". If you want a simple rule - the longer your password the better (And on a human note, use something you can remember, and do not have to write down because it's complex)
MyCatLikesNapsAndTummyRubs has a far higher entropy than mYc4tSl33ps despite the apparent complexity of the two phrases, and is hence, a far stronger password. With the added bonus that I don't need to write it down.
Anyway, see https://confluence.atlassian.com/cloud/set-password-requirements-744721633.html and look at the article on entropy in the middle (although I prefer https://xkcd.com/936/ )
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