Complex sentence: The Swabian Circle successfully negotiated with the French for neutrality; during negotiations, there was considerable discussion over how the Swabians would hand over their weapons to the French, but it was a moot point: the weapons had already been taken by Fröhlich.
Split into simpler sentences: The Swabian Circle successfully negotiated with the French for neutrality;. During negotiations, there was considerable discussion over how the Swabians would hand over their weapons to the French, but it was a moot point: the weapons had already been taken by Fröhlich.