Simplify the following text for a Grade 5 native English-speaking person.
Original: The Opium Wars , also known as the Anglo-Chinese Wars , divided into the First Opium War from 1839 to 1842 and the Second Opium War from 1856 to 1860 , were the climax of disputes over trade and diplomatic relations between China under the Qing Dynasty and the British Empire .
Simplified: The Second Opium War was from 1856 to 1860 .