Complex sentence: Alphonse Gavioli is among some of the most famous mechanical organ builders in history and has built many great instruments in their factory in Paris, a reasonable number of these instruments survive today, the majority of them being in Europe.
Split into simpler sentences: Alphonse Gavioli is among the most famous mechanical organ builders and has built many instruments in their factory in Paris. A reasonable number of these instruments survive today, the majority of them in Europe.