Complex sentence: This number has never been accurately calculated and estimates vary depending on if you include slaves in the colonial population numbers, count women as potential combatants, etc. Participation rate of the eligible population is estimated to have been higher than most American military conflicts.
Split into simpler sentences: This number has never been accurately calculated, and estimates vary depending on whether or not slaves are included in the colonial population numbers and women are counted as potential combatants. The participation rate of the eligible population is estimated to have been higher than in most other American military conflicts.