Complex sentence: As Pam is putting the finishing touches on her outfit, someone else is shown putting on a combat uniform, and arming himself with a bayonet, hunting knife, and a sawed-off shotgun.
Split into simpler sentences: As Pam is putting the finishing touches on her outfit, someone else is getting ready too. But this person is putting on his combat uniform, complete with bayonet, hunting knife, and a sawed-off shotgun.