Complex sentence: The original primary school near the loch was a small school of fewer than 100 pupils and composite classes; in 1996 this changed due to a slightly increasing population and was able to teach classes in separate classrooms with respect to their year of schooling.
Split into simpler sentences: The original primary school near the loch was a small school of fewer than 100 pupils and composite classes. In 1996 this changed, due to a slightly increasing population, and the school was now able to teach students in separate classrooms organised by their year of schooling.