Complex sentence: Switzerland's neutrality had protected the town during World War II and most of the venues were in place from the 1928 Games, which made St. Moritz a logical choice to become the first city to host a Winter Olympics twice.
Split into simpler sentences: Switzerland's neutrality had protected the town during World War II and most of the venues were in place from the 1928 Games, which made St. Moritz a logical choice. It became the first city to host a Winter Olympics twice.