Complex sentence: He received his PhD in Mechanical Engineering from Belarusian National Technical University and he published about 100 publications and was author/co-author of about 70 inventions (USSR Author's Certificates).
Split into simpler sentences: He received his PhD in Mechanical Engineering from Belarusian National Technical University. He published about 100 publications and was author/co-author of about 70 inventions (USSR Author's Certificates).