Simplify the following text for a Grade 11 native English-speaking person.
Original: Geneva hosts the international headquarters of companies like JT International ( JTI ) , Mediterranean Shipping Company , Serono , SITA , SociÃ tÃ GÃ nÃ rale de Surveillance and STMicroelectronics .
Simplified: Geneva hosts the international headquarters of companies like JT International ( JTI ) , Mediterranean Shipping Company , , Serono , Serono S.A. was bought by the German Merck KGaA ( not to be mistaken with the American Merck & Co. ) in 2006 and operates now under Merck Serono S.A. as one of the ten biggest bio-pharmaceutical companies in the World SITA , SociÃ tÃ GÃ nÃ rale de Surveillance , STMicroelectronics , and Weatherford International .