Complex sentence: On Cancienne Plantation, Leo Seprien built a one-room school house and asked the school board to supply the teacher to accommodate the students who were the children of "Hardtimes Plantation" and surrounding areas.
Split into simpler sentences: On Cancienne Plantation, Leo Seprien built a one-room school house. He petitioned the school board to supply the teacher in order to properly accommodate the students who were the children of "Hardtimes Plantation" workers, as well as children from surrounding areas.