Complex sentence: The album was produced by and tipped for a US release with Jay Z's entertainment company,' Roc Nation' however this was later disputed by the group who claim that Roc Nation was only signed to A&R/produce "Sweet 7".
Split into simpler sentences: The album was produced by and tipped for a US release with Jay Z's entertainment company Roc Nation. This was later disputed by the group who claim that Roc Nation was only signed to serve as A&R, as well as produce "Sweet 7".