Simplify the following text for a Grade 6 native English-speaking person.
Original: One of FurtwÃ ngler 's protegÃ s was pianist Karlrobert Kreiten . He was also an important influence on the pianist\/conductor Daniel Barenboim , of whom FurtwÃ ngler 's widow , Elisabeth FurtwÃ ngler , said , `` Er furtwÃ nglert '' ( `` He furtwÃ nglers '' ) .
Simplified: FurtwÃ ngler gave many successful concerts after the war .