Simplify the following text for a Grade 11 native English-speaking person.
Original: Already in the professional era , Gimnasia y Esgrima La Plata entered in the history of Argentine soccer with a famous team known as `` El Expreso '' ( The Express ) .
Simplified: Gimnasia y Esgrima La Plata entered into the history of Argentine football with a famous team known as `` El Expreso '' ( The Express ) .