Complex sentence: As of 2013, two Meteors, "WL419" and "WA638", remain in active service with the Martin-Baker company as ejection seat testbeds; two further aircraft in the UK remain airworthy, a single Meteor in Australia is also flight-capable.
Split into simpler sentences: As of 2013, two Meteors, "WL419" and "WA638", remain in active service with the Martin-Baker company as ejection seat testbeds. Two further aircraft in the UK remain airworthy, while a single Meteor in Australia is also flight-capable.