Complex sentence: Selinger, Sellinger ancient name that derives from Leodegar, Ludger became later on a noble German family name that spread via France/St. Leger family to England and further over seas.
Split into simpler sentences: Selinger, Sellinger ancient name that derives from Leodegar, Ludger became later on a noble German family name. Selingers spread several times in Europe; e.g. via France/St. Leger family to England and further over seas.