Complex sentence: When it first opened its doors, in may 1914, there where only 22 students, this number rapidly grew and in 1916 the students of the mining school moved to a different location (the Mijnschool).
Split into simpler sentences: When it first opened its doors, in may 1914, there where only 22 students. This number rapidly grew and in 1916 the students of the mining school moved to a different location (the Mijnschool).