Complex sentence: Soon after graduating, she left for Hong Kong where she joined the Diocesan Girls School and was there for four years and loved Hong Kong so much that she returned a second time and served another four years as the head of mathematics.
Split into simpler sentences: Soon after graduating, she left for Hong Kong where she joined the Diocesan Girls School and was there for four years. She loved Hong Kong so much that she returned a second time and served another four years as the head of mathematics.