Complex sentence: On April 6,1252, when Peter was returning from Como to Milan, the two assassins followed Peter to a lonely spot near Barlassina, and there killed him and mortally wounded his companion Domenico.
Split into simpler sentences: On April 6,1252, when Peter was returning from Como to Milan. The two assassins followed Peter to a lonely spot near Barlassina, and there killed him and mortally wounded his companion Domenico.