Complex sentence: "I must have wanted this" is the type of catchphrase used by adherents of this doctrine when encountering situations, pleasant or unpleasant, to remind them that their own desires and choices led to the present outcome.
Split into simpler sentences: I must have wanted this is the catchphrase used by adherents when encountering situations, pleasant or unpleasant. Phrases such as this remind that their own desires and choices led to the present outcome.