Complex sentence: Eclogitization is the tectonic process in which the apperance of high-pressure, metamorphic facies, eclogite leads to an increase in crustal densities, kinematics, and plate motion of subduction zones.
Split into simpler sentences: Eclogitization is the tectonic process in which the appearance of high-pressure, metamorphic facies, eclogite leads to an increase in crustal densities. These crustal density changes lead to a change in plate kinematics, and plate motion of subduction zones.