Complex sentence: The first part of its name is derived from the fact that it orbits the star Kepler-11, which was named for the Kepler Mission that flagged it as host to several potential transit events under the name KOI-157.
Split into simpler sentences: The first part of its name is derived from the fact that it orbits the star Kepler-11. The host star, Kepler-11, was named for the Kepler Mission that flagged it as host to several potential transit events under the name KOI-157.