Why was clozapine an improvement over previous antipsychotic medications?

Because it reduced both positive and negative symptoms of schizophrenia. Clozapine is an antipsychotic medication that works by changing the actions of chemicals in the brain. Clozapine is used to treat severe schizophrenia, or to reduce the risk of suicidal behavior in people with schizophrenia or similar disorders.

There three methods of regulating campaign funding in state elections:
1)  the imposition of disclosure and reporting requirements.
2) providing a method for public financing of elections - candidates can accept public funds to conduct their campaign.
3) setting contribution limits to candidate’s campaigns.