Complex sentence: On 28 February 2013 McCartney was obliged to apologise to the Independent Parliamentary Standards Authority (IPSA) for the content of notes sent by him to staff and described by Chief Executive, Andrew McDonald as'abusive offensive' and'condescending'.
Split into simpler sentences: On 28 February 2013 McCartney apologised to the Independent Parliamentary Standards Authority (IPSA) for the content of notes he had sent to staff. The notes were described by IPSA Chief Executive, Andrew McDonald as'abusive offensive' and'condescending'.