Complex sentence: In Germany alone, U.S forces found about 1,500 repositories that contained art and cultural objects looted from institutions and individuals across Europe, as well as German and Austrian museum collections that had been evacuated for safekeeping.
Split into simpler sentences: In Germany alone, U.S forces found approximately 1,500 repositories of art and cultural objects. These hiding places contained objects looted from institutions and individuals across Europe, as well as German and Austrian museum collections that had been evacuated for safekeeping.