Complex sentence: Divisions became more intense among Greeks and that is why in the legislative elections the right-wing parties were strengthened, while on the other hand, the centrist parties that followed a more moderate but also more ambiguous policy lost part of their power.
Split into simpler sentences: Divisions became more intense among Greeks and, during the legislative elections, the right-wing parties were strengthened. The centrist parties (that followed a more moderate but also more ambiguous policy) lost part of their power.