Cu2IS-II + 12 HNVO3 CuII[NVO3]2 + CuIISVIO4 + 10 NIVO2 + 6 H2O

This is a complexation reaction: Cu[NO3]2 is the formed complex.

This is an oxidation-reduction (redox) reaction:

2 CuI - 2 e- 2 CuII (oxidation)

S-II - 8 e- SVI (oxidation)

10 NV + 10 e- 10 NIV (reduction)

Change the oxidation states