Complex sentence: The mercenary leader will not order a rescue as he is concerned that the missing Tatmadaw will put the rest on alert, however Rambo shows up with what is revealed to be his bow and shoots down the Tatmadaw.
Split into simpler sentences: The mercenary leader will not order a rescue, as he is concerned that the missing Tatmadaw will put the rest on alert. However, Rambo shows up with what is revealed to be his bow and shoots down the Tatmadaw.