When it's sunny, you can't get rid of shadows, but you can try to fill them in order to reduce contrast. If the subject is close enough, fill-flash or a reflector may help. If not, then pre-flashing your film may help a bit.
To help with color saturation in the sunlit areas, a polarizing filter can help.
Shooting subjects in open shade eliminates the sun and approximates the type of soft illumination of cloudy days. However, unless there are a lot of white clouds in the sky, the light from the sky is often predominantly blue. In this case, a warming filter like one of the 81 series filters can help.
Best,
Doremus