Complex sentence: German gas attacks were among the most traumatic experiences for the Southern Rhodesians in Europe; one Rhodesian survivor of a gas attack described the sensation as like "suffocation, (or) slow drowning".
Split into simpler sentences: German gas attacks were among the most traumatic experiences for the Southern Rhodesians in Europe. One Rhodesian survivor of a gas attack described the sensation as like "suffocation, (or) slow drowning".