Simplify the following text for a Grade 7 native English-speaking person.
Original: In 1871 Henry Campbell became Henry Campbell-Bannerman , the addition of the surname Bannerman being a requirement of the will of his uncle , Henry Bannerman , from whom he inherited the estate of Hunton Court in Kent .
Simplified: The surname Bannerman was added to his surname in 1871 as required by his uncle 's will . It was a requirement of his inheritance of his uncle 's Kent estate , Hunton Court .