Complex sentence: Fricktal was a canton of the Helvetic Republic from February 1802 to February 1803, consisting of that part of the Breisgau (in Habsburg Further Austria) south of the Rhine.
Split into simpler sentences: Fricktal was a canton of the Helvetic Republic from February 1802 to February 1803. Before its formation, the territories were that part part of the Breisgau, in Habsburg Further Austria located south of the Rhine.