Generate a sentence that describes the following data: Germany, demonym, Germans; Neptun Werft, city, Rostock; Germany, leader, Joachim Gauck; Rostock, country, Germany; A-Rosa Luna, builder, Neptun Werft
A-Rosa Luna was made by Neptun Werft headquartered in Rostock, Germany. Germans are from Germany whose leader is Joachim Gauck.