Complex sentence: In November 2007, the "BER-Infotower" opened a high public observation tower and information center, part of the airport's visitor facilities, which also had a webcam of the construction progress.
Split into simpler sentences: In November 2007, the "BER-Infotower" opened a high public observation tower and information center. It was part of the airport's visitor facilities, which also had a webcam of the construction progress.