This chemical equation seems to be unbalanced and confusing. It appears to be a combination of different chemical compounds involving calcium, carbonate, hydroxide, nitrate, and chloride ions. To properly balance this equation and identify the reactants and products, the chemical equation needs to be reformatted.

A possible balanced equation for the reaction described in the question could be:

CaCO3 $s$ + Ca$OH$2 $aq$ + Ca$NO3$2 $aq$ + CaCl2 $aq$ → Ca$NO3$2 $aq$ + CaCl2 $aq$

In this reaction, calcium carbonate $CaCO3$ reacts with calcium hydroxide $Ca(OH)2$, calcium nitrate $Ca(NO3)2$, and calcium chloride $CaCl2$ to form calcium nitrate $Ca(NO3)2$ and calcium chloride $CaCl2$. This balanced equation shows the reactants on the left side and the products on the right side.