Complex sentence: Pachira is seen during the course of the anime as a vampire and while she displays the common weakness of vampires such as a weakness to garlic and holy water, her biggest weakness (at least in her mind) is her small breast size.
Split into simpler sentences: Pachira is seen during the course of the anime as a vampire. While she displays the common weakness of vampires such as a weakness to garlic and holy water, her biggest weakness (at least in her mind) is her small breast size.