Complex sentence: The leaves are glossy green, often bronze-red when newly opened, lanceolate to narrow ovate, 5--12 cm long and 2--3 cm broad, with a serrated margin.
Split into simpler sentences: The leaves are glossy green and often bronze-red when newly opened. They are lanceolate to narrow ovate, 5--12 cm long and 2--3 cm broad, with a serrated margin.