Complex sentence: Due to the increase in tourist foot traffic, and a common penchant for being "handsy", the statue's cleavage has been groped often enough that its bronze hue has begun to wear off on the bosom.
Split into simpler sentences: Due to the increase in tourist foot traffic, and their penchant for being "handsy", the statue's cleavage has been groped repeatedly recently. Enough so that its bronze hue has begun to wear off on the bosom.