Complex sentence: Altrincham's increasing population prompted the founding of more schools during the early 19th century and by 1856 the town had 9 schools, 1 college, and 23 teachers.
Split into simpler sentences: Altrincham's increasing population prompted the founding of more schools during the early 19th century. By 1856 the town had 9 schools, 1 college, and 23 teachers.