Complex sentence: This search, by Officer Sam Wood, discovers an African-American northerner Virgil Tibbs in the waiting room of the Sparta train station, whose waiting room is open; but unstaffed, as the station is closed at that hour.
Split into simpler sentences: This search, by Officer Sam Wood, discovers an African-American northerner Virgil Tibbs in the waiting room of the Sparta train station. The waiting room is open but unstaffed as the station is closed at that hour.