Complex sentence: Rather than aiming to simulate realistic real-world physics, it emulates complex cartoon physics; the physics engine calculates the relevant parts of physical interaction as they would in reality, and then distorts the physical laws to produce a cartoon-like interaction.
Split into simpler sentences: Rather than aiming to simulate realistic real-world physics, it emulates complex cartoon physics. The physics engine calculates the relevant parts of physical interaction as they would in reality, and then distorts the physical laws to produce a cartoon-like interaction.