Complex sentence: It should be noted that it is unlawful to negotiate a private business agreement under color of uniform, Lemmen at some point during his time in Iraq started to openly wear his uniform while on U.S. bases in Iraq.
Split into simpler sentences: It should be noted that it is unlawful to negotiate a private business agreement under color of uniform. During his time in Iraq, Lemmen started to openly wear his uniform while on U.S. bases in Iraq.