Complex sentence: In October 2007, Calera de León was selected, along with 19 other towns in the Old World, to be part of the documentary film "Peoples of Europe" which makes it one of the few Spanish cities to be part of this project.
Split into simpler sentences: In October 2007, Calera de León was selected, along with 19 other towns in the Old World, to be part of the documentary film "Peoples of Europe". This makes it one of the few Spanish cities to be part of this project.