Reword the paragraph
However, the MA does not use these data at its disposal to follow up any employment effectiveness indicator because the OP has made provision for this indicator to be followed up using information from national surveys organised by the statistical office.
Nevertheless, this information at its disposal is not used by a MA as an indicator of success in subsequent recruitments, because measures have been adopted within OPS whereby information from research organised by statistical authorities in Member States is used for monitoring this indicator.