Complex sentence: The "Juno" mission is set to conclude in February 2018, after completing 37 orbits of Jupiter, when the probe will be de-orbited to burn up in Jupiter's outer atmosphere, to avoid any possibility of impact and biological contamination of one of its moons.
Split into simpler sentences: The "Juno" mission was planned to conclude in February 2018, after completing 37 orbits of Jupiter. Then the probe was intended to be de-orbited and burn up in Jupiter's outer atmosphere, to avoid any possibility of impact and biological contamination of one of its moons.