Complex sentence: The school was built near the river Sugandha, but river erosion spoiled this historic school, and a new school was later built near the old one in two stories, in the shape of the letter "H".
Split into simpler sentences: The school was built near the river Sugandha, but river erosion spoiled this historic school. A new school was built near the old one in two stories, in the shape of the letter "H".