Complex sentence: The group publishes a gazetteer of illegal metric signs it has either persuaded authorities to amend, or which they have removed or amended; by the end of 2006 the tally stood at over 3,000.
Split into simpler sentences: The group publishes a gazetteer of illegal metric signs it claims it has either persuaded authorities to amend, or which they have removed or amended. At the end of 2006 the group claimed that tally stood at over 3,000.