Complex sentence: Toye studied at the Royal College of Music and, beginning in 1913, conducted in London theatres Chislett and in 1914 was entrusted by Ralph Vaughan Williams with the première of his London Symphony at the Queen's Hall.
Split into simpler sentences: Toye studied at the Royal College of Music and, beginning in 1913, conducted in London theatres. Chislett In 1914, he was entrusted by Ralph Vaughan Williams to conduct the première of his London Symphony at the Queen's Hall.