Complex sentence: However, prior to the battle both received reinforcements from other units rather than fresh recruits and were much superior in manpower to other Russian units on the Polish front; on August 15 Polish intelligence reported their strength as "three to four standard Russian divisions".
Split into simpler sentences: However, prior to the battle both received reinforcements from other units rather than fresh recruits and were much superior in manpower to other Russian units on the Polish front. Whatever the reason, on August 15th Polish intelligence reported the strength of both divisions as "three to four standard Russian divisions".