Complex sentence: It includes the names the 1,546 Canadian volunteers who served in Spain, if one includes all those who served in the Mac-Pap batallion and the medical, communications, transportation and translation corps, or in other brigades.
Split into simpler sentences: It includes the names of the 1,546 Canadian volunteers who served in Spain. This number includes all those who served in the Mac-Pap batallion, the medical, communications, transportation and translation corps, or in other brigades.