Complex sentence: Gould eventually departed Lhasa, but left behind his commercial representative, Hugh Richardson (who had been previously stationed in Gyantse), who he equipped with a radio so Richardson could maintain contact with the British.
Split into simpler sentences: Gould eventually departed Lhasa, but left behind his commercial representative, Hugh Richardson, who had been previously stationed in Gyantse. Richardson was equipped with a radio so Richardson could maintain contact with the British.