Simplify the following text for a Grade 8 native English-speaking person.
Original: RTÃ Performing Groups supports two full-time orchestrasâ '' the RTÃ Concert Orchestra and RTÃ National Symphony Orchestraâ '' as well as the RTÃ Vanbrugh Quartet , RTÃ Philharmonic Choir , and RTÃ CÃ r na nÃ `` g. These groups perform regularly in the National Concert Hall and The Helix in Dublin . The five groups present over 250 events annually , including live performances and work in education .
Simplified: The RTÃ Performing Groups are five classical musical groups .