Complex sentence: A ballistic trajectory involves launching from the surface and temporarily escaping the atmosphere; after re-entering the atmosphere, the machine follows a parabolic course to its target point while maintaining the vast acceleration obtained from the effects of gravity.
Split into simpler sentences: A ballistic trajectory involves launching from the surface and temporarily escaping the atmosphere. After re-entering the atmosphere, the machine follows a parabolic course to its target point while maintaining the vast acceleration obtained from the effects of gravity.