Complex sentence: While Sydney was the primary sculptor, all of the March artists participated in the creation of the monument that was dedicated to the Inniskilling Fusiliers who died in the Boer War (1899--1902).
Split into simpler sentences: While Sydney was the primary sculptor, all of the March artists participated in the creation of this monument. It was dedicated to the Inniskilling Fusiliers who died in the Boer War (1899--1902).