Simplify the following text for a Grade 13 native English-speaking person.
Original: An agreement with the Swiss government signed on March 19 , 1993 , affirmed the already long-standing policy of full independence of the Committee from any possible interference by Switzerland .
Simplified: An agreement with the Swiss government signed on 19 March 1993 , affirmed the already long-standing policy of full independence of the Committee from any interference by Switzerland .