Complex sentence: In the last two decades, Pleyel Piano was bought by the same family which had bought the Salle Pleyel concert hall in order to revive the name and quality of Pleyel pianos.
Split into simpler sentences: In the last two decades Pleyel Piano was bought by the same family which had bought the Salle Pleyel concert hall. They bought it because they wanted to revive the name and quality of Pleyel pianos.