Complex sentence: The cost of living in Hawaii, specifically Honolulu, is high compared to that of most major U.S. cities, although it is 6.7% lower than in New York City and 3.6% lower than in San Francisco.
Split into simpler sentences: The cost of living in Hawaii, specifically Honolulu, is high compared to that of most major U.S. cities. However, the cost of living in Honolulu is 6.7% lower than in New York City and 3.6% lower than in San Francisco.