Simplify the following text for a Grade 11 native English-speaking person.
Original: During HÃ ctor DomÃ nguez 's presidency , the abbreviation at the center of the shield was changed , replacing the historical CGE ( Club de Gimnasia y Esgrima ) , for the GELP ( Gimnasia y Esgrima La Plata ) , modification that persisted during the mandates of Gliemmo and MuÃ oz .
Simplified: During HÃ ctor DomÃ nguez 's presidency , the abbreviation CGE ( Club de Gimnasia y Esgrima ) at the center of the shield was replaced by GELP ( Gimnasia y Esgrima La Plata ) .