Complex sentence: Magriñat, who had also been arrested was then released, and he apparently a loose end was ultimately killed in Cuba by "Communists" in 1933 (Albers, 2002).
Split into simpler sentences: Magriñat, who had also been arrested was then released. Apparently a loose end, he was ultimately killed in Cuba by "Communists" in 1933 (Albers, 2002).