Complex sentence: This is because the resonance contributor of this molecule creates two aromatic structures, one being the positively charged cyclopropenium cation and the other being the negatively charged cyclopentadienyl anion.
Split into simpler sentences: This is because the resonance contributor of this molecule creates two aromatic structures. One being the positively charged cyclopropenium cation and the other being the negatively charged cyclopentadienyl anion.