Complex sentence: General Lionel Charles Dunsterville (1865--1946) was a British general, who led the so-called "Dunsterforce" across present-day Iran in an attempt to prevent an invasion of India by a combined Germano-Turkish force.
Split into simpler sentences: General Lionel Charles Dunsterville (1865--1946) was a British general. He led the so-called "Dunsterforce" across present-day Iran in an attempt to prevent an invasion of India by a combined Germano-Turkish force.