Complex sentence: Three to five million cubic kilometers of magma were intruded overall, being the fourth largest known lava intrusion, after Ontong Java Plateau, Deccan Traps and the Siberian Traps.
Split into simpler sentences: Three to five million cubic kilometers of magma were intruded overall, being the planet's fourth largest known lava intrusion,. After Ontong Java Plateau, Deccan Traps and the Siberian Traps.