Original sentence: The BBC announced on 24th April that it would suspend its membership from May 30 until September 18
Edited sentence: Meaning that all it's news coverage of the referendum between 24/4 & 30/5 would be done as a paid member of a registered No campaign group.The BBC, belatedly, and only after some pressure, announced on 24th April that it too would suspend it's membership until the 18th September, but not until 30th May