Complex sentence: In 1914, the St. John's School 135 girls and boys in attendance, while the other schools in the cantonment St. Aloysius School had 280 students, the Wesleyan Mission Secondary School had 235, and the St. Andrews School had many students.
Split into simpler sentences: In 1914, the St. John's School had 135 girls and boys in attendance. As for the other schools in the cantonment, St. Aloysius School had 280 students, the Wesleyan Mission Secondary School had 235, and St. Andrews School had many students.