Complex sentence: The artwork took an estimated three months to paint, and it was greatly admired at the time, and was bought for the highest price Millais had at the time received from dealer and publisher Ernest Gambart-the luctrative sum of 100 guineas.
Split into simpler sentences: The artwork took an estimated three months to paint, and it was greatly admired at the time. It was also bought for the highest price Millais had ever received from dealer and publisher Ernest Gambart-the luctrative sum of 100 guineas.