Complex sentence: The Budapest Philharmonic Orchestra (Hungarian: "Budapesti Filharmóniai Társaság Zenekara") is Hungary's oldest functioning orchestra, being founded in 1853 by Ferenc Erkel under the auspices of the Budapest Philharmonic Society.
Split into simpler sentences: The Budapest Philharmonic Orchestra (Hungarian: "Budapesti Filharmóniai Társaság Zenekara") is Hungary's oldest extant orchestra. It was founded in 1853 by Ferenc Erkel under the auspices of the Budapest Philharmonic Society.