Complex sentence: There are not many metric signs left on Britain's roads and footpaths, but an A.R.M. statement in May 2007 confirmed that they were still active in carrying out amendments on those that are left.
Split into simpler sentences: There are not many metric signs left on roads and footpaths in the UK. An A.R.M. statement in May 2007 though confirmed that they were still active in carrying out amendments on those that are left.