Complex sentence: Pećanac declined his request and suggested that he might offer Mihailović the chief of staff position and recommended Mihailović's detachments disband and join his detachments.
Split into simpler sentences: Pećanac declined his request and suggested that he might offer Mihailović the position as his chief of staff. He also recommended that Mihailović's detachments disband and join his detachments.