Complex sentence: While Galliane proposed a new look, its primary purpose was a new functionality for the frog, giving a helicoidial shape to the bow hair that follows the natural movement of the string player's arm.
Split into simpler sentences: While Galliane proposed a new look, its primary purpose was a new functionality for the frog. It gives a helicoidial shape to the bow hair that in turn follows the natural movement of the string player's arm.