Wall Switch

I have a switch box with two leads feeding into it, one from a ceiling fixture and one from two wall sconces. Today, it is not connected properly and the switch does not work the wall sconces. Also, the ceiling fixture has solid gauge wire while the sconces have the typical black, white and green.

I would like to connect both fixtures to one switch properly--is there a risk that the two fixtures will carry too much of a load for a standard single pole 15amp 120vac switch?

Thanks,

Tim