Complex sentence: One of the places where the antimatter production is the highest is at CERN in Switzerland, with a series of antiproton decelerators and coolers, producing up to 100 atoms of antimatter per second.
Split into simpler sentences: One of the places where the antimatter production is the highest is at CERN in Switzerland. With a series of antiproton decelerators and coolers, producing up to 100 atoms of antimatter per second.