Spanish to English Bus/Financial Law: Taxation & Customs

Hi.

I'm proofreading a collection of translated documents, including a section on personal tax returns.

Heading: "Aportaciones a sistemas de previsión social de los que es participe, mutualista o titular el cónyuge del contribuyente
Total con derecho a reducción"

Translation: "Contributions to social security which the spouse of the taxpayer is partner, mutual or holder
Total with right of reduction"

I don't like it but am struggling to see the wood for the trees at the moment.

Thanks in advance