Complex sentence: Leyton County High School for Boys, formed in 1916 by amalgamation of Leyton and Leytonstone high schools, occupied temporary premises at Connaught Road until 1929, when it moved to new buildings in Essex Road.
Split into simpler sentences: Leyton County High School for Boys, was formed in 1916 by amalgamation of Leyton and Leytonstone high schools. The school occupied temporary premises at Connaught Road until 1929, when it moved to new buildings in Essex Road.