Complex sentence: Before that each district or Regional Transport Officer's office had a three letter code without mentioning the state, which lead to a fair degree of confusion--for example, MMC 8259 could fit in anywhere in the country.
Split into simpler sentences: Before that each district or Regional Transport Officer's office had a three-letter code which did not mention the state. This led to a fair degree of confusion--for example, MMC 8259 could fit in anywhere in the country.