Complex sentence: The Vladimir Tiara, sometimes referred to as the Diamond and Pearl Tiara, was purchased along with a diamond riviere in 1921 by Queen Mary from Grand Duchess Elena Vladimirovna of Russia, for a price of £28,000 (£1,091,300 in 2015).
Split into simpler sentences: The Vladimir Tiara, sometimes referred to as the Diamond and Pearl Tiara, was purchased in 1921 by Queen Mary from Grand Duchess Elena Vladimirovna of Russia. The tiara was sold to Queen Mary along with a diamond riviere for a price of £28,000 (£1,091,300 in 2015).