Complex sentence: The majority of the Concessions remained untouched by the conflict, and it was often the case that those in the Shanghai International Settlement would watch the war from the banks of Suzhou Creek, and could even visit the battle lines by virtue of their extraterritoriality.
Split into simpler sentences: The majority of the Concessions remained untouched by the conflict and it was often the case that those in the Shanghai International Settlement would watch the war from the banks of Suzhou Creek. They could even visit the battle lines by virtue of their extraterritoriality.