Complex sentence: The house group with the highest number of points (merits) at the end of the school year win the house cup, although not many pupils seem very enthusiastic about the system, they are constantly pushed by senior management members to strive to achieve.
Split into simpler sentences: The house group with the highest number of points (merits) at the end of the school year win the house cup. Although not many pupils seem very enthosiastic about the system, they are constantly pushed by senior mangment members to strive to achieve.