Complex sentence: The AAT is now one of the accountancy bodies in the UK allowed to let its suitably experienced and qualified members perform independent examinations of charities accounts, subject to the audit exemption thresholds for incorporated charities.
Split into simpler sentences: The AAT is now one of the accountancy bodies in the UK allowed to let its suitably experienced and qualified members perform independent examinations of charities accounts. Subject of course to the audit exemption thresholds for incorporated charities.