Complex sentence: Shortly thereafter the 4th Foreign Regiment was reestablished as the 4th Demibrigade of the Foreign Legion; under that name the 4th Foreign Regiment operated as part of the Free French forces until 1943 when it was again disbanded as part of another French military reorganization.
Split into simpler sentences: Shortly thereafter the regiment was reestablished as the 4th Demibrigade of the Foreign Legion. Under that name it operated as part of the Free French forces until 1943 when it was again disbanded as part of another French military reorganization.