Complex sentence: It's students came from Teesville, neighbouring towns and villages, and nearby Eston with the latter taking a sizeable part in the school enrolment, which before closure was around 1250, including 400 in the sixth form.
Split into simpler sentences: It's students came from Teesville, neighbouring towns and villages, and nearby Eston with the latter taking a sizeable part in the school enrollment. Enrollment before closure was around 1250, including 400 in the sixth form.