Complex sentence: Bulgarian communist Todor Angelov took part in Belgian Resistance movement, in early 1943 he was arrested and interned in the Fort Breendonk concentration camp, where he was executed in late November 1943.
Split into simpler sentences: Bulgarian communist Todor Angelov took part in the Belgian Resistance movement. In early 1943, he was arrested and interned in the Fort Breendonk concentration camp, where he was executed in late November 1943.