Complex sentence: Akira Shiraishi, a boy widely regarded as the "princess" in his all-boys high school,, decides to pursue Mizuki Sakurazaka, the "prince" of the neighbouring all-girls High.
Split into simpler sentences: Akira Shiraishi, a boy widely regarded as the "princess" in his all-boys high school,, decides to pursue Mizuki Sakurazaka. Mizuki is the "prince" of the neighbouring all-girls High.