Complex sentence: In addition, there were 9,000--10,000 regionally-organized reserve police; these were set up in 16 battalions and 10 independent companies, but the units lacked weapons.
Split into simpler sentences: In addition, there were 9,000--10,000 regionally-organized reserve police. The reserve police were set up in 16 battalions and 10 independent companies, but the units lacked weapons.