Complex sentence: As a result of pressure, friction, and plate material melting in the mantle, earthquakes and volcanoes are common near convergent bouther, they form either a subduction zone or a continental collision.
Split into simpler sentences: As a result of pressure, friction, and plate material melting in the mantle, earthquakes and volcanoes are common near convergent boundaries. When two plates move towards one another, they form either a subduction zone or a continental collision.