Complex sentence: In ratings of leadership ability 70% of the students put themselves above the median and in ability to get on well with others 85% put themselves above the median and 25% rated themselves in the top 1%.
Split into simpler sentences: In ratings of leadership ability, 70% of the students put themselves above the median. In ability to get on well with others, 85% put themselves above the median, and 25% rated themselves in the top 1%.