Complex sentence: Tom admits his involvement in an operation that resulted in the loss of civilians, for which he was blamed; however, he maintains that he is innocent, and he was made a scapegoat as only he could identify the men who did carry out the killings.
Split into simpler sentences: Tom admits his involvement in an operation that resulted in the loss of civilians, for which he was blamed. However, he maintains that he is innocent, and he was made a scapegoat as only he could identify the men who did carry out the killings.