Complex sentence: The silver maple is closely related to the red maple ("Acer rubrum "), and can hybridise with it, the hybrid being known as the Freeman maple ("Acer " x"freemanii").
Split into simpler sentences: The silver maple is closely related to the red maple ("Acer rubrum "), and can hybridise with it. The hybrid variation is known as the Freeman maple ("Acer " x"freemanii").