Complex sentence: According to Ostrovsky the book pointed out mistakes and unnecessarily malicious intent in Mossad operations and referred to Mossad officers only by their first name and agents by code names thus never placing anyone in danger.
Split into simpler sentences: According to Ostrovsky, the book pointed out mistakes and unnecessarily malicious intent in Mossad operations. And by referring to Mossad officers only by their first name and agents by code names, Ostrovsky maintains he never placed anyone in danger.