Complex sentence: However, in the case of large changes of momentum, such as a spacecraft being launched into orbit, the effect becomes significant the fastest and most fuel-efficient path to orbit is a launch from the equator which curves to a directly eastward heading.
Split into simpler sentences: However, in the case of large changes of momentum, such as a spacecraft being launched into orbit, the effect becomes significant. The fastest and most fuel-efficient path to orbit is a launch from the equator which curves to a directly eastward heading.