Complex sentence: The square piano had horizontal strings arranged diagonally across the rectangular case above the hammers and with the keyboard set in the long side, it is variously attributed to Silbermann and Frederici and was improved by Petzold and Babcock.
Split into simpler sentences: The square piano had horizontal strings arranged diagonally across the rectangular case above the hammers and with the keyboard set in the long side. It is variously attributed to Silbermann and Frederici and was improved by Petzold and Babcock.