Complex sentence: The minor planet is named after Czech amateur astronomer Peter Mrva (b.1962) who participated in the construction the discovering Modra observatory, after which the minor planet 11118 Modra is named.
Split into simpler sentences: The minor planet is named after Czech amateur astronomer Peter Mrva (b.1962). He helped to build the discovering Modra observatory, after which the minor planet 11118 Modra is named.