Complex sentence: Over the decades, however, the role of the Federal Border Guard, and even its name, changed-today the Federal Police is also responsible for the security of the railway network, provides airport security and protects federal buildings.
Split into simpler sentences: Over the decades, however, the role of the Federal Border Guard and even its name have canged. The Federal Police is also responsible for the security of the railway network, airport security and the protection of federal buildings.