Complex sentence: Originally named the Preparatory High School for Colored Youth and from 1891 to 1916 as M Street High School, the school was founded as an educational mission at the Fifteenth Street Presbyterian Church.
Split into simpler sentences: Originally named the Preparatory High School for Colored Youth, from 1891 to 1916 it was known as M Street High School. The school was founded as an educational mission at the Fifteenth Street Presbyterian Church.