Hello Mark,

You can be honest and tell the embassy officers that you want to relocate to Spain as the final intention is to obtain the Spanish nationality, but do not indicate it as the only reason as this will make them think you will not effectively reside there.

You need to be sure that you spend at least 6 months in Spain per year ( count 6 months back starting the last date of entry in Spain when you file for the renewal application).

Regards,