Complex sentence: Adolphe Marval was born in France and may have taught at Ecclesall College, Sheffield and came to South Australia in 1864 to teach at St. Peter's College, and took private classes and other private schools, notably J. L. Young's Adelaide Educational Institution.
Split into simpler sentences: Adolphe Marval was born in France and may have taught at Ecclesall College, Sheffield before he came to South Australia in 1864 to teach at St. Peter's College. He also conducted private classes and taught at other private schools, notably J. L. Young's Adelaide Educational Institution.