Complex sentence: A painting of the subject has been attributed or reattributed to Leonardo da Vinci since 2011; this painting broke records in 2017, when it was sold for the highest auction price in the world.
Split into simpler sentences: A painting of the subject has been attributed or reattributed to Leonardo da Vinci since 2011. The painting broke records in 2017, when it was sold for the highest auction price in the world.