Complex sentence: The name is Celto-British in derivation, and may be named after the Iceni tribe, who may have established this route to permit trade with other parts of the country from their base in East Anglia.
Split into simpler sentences: The name is Celto-British in derivation, and may be named after the Iceni tribe. They may have established this route to permit trade with other parts of the country from their base in East Anglia.