"Los méritos del proceso (o de los autos o de la causa) no son sino las pruebas, antecedentes y razones resultantes del proceso y que constituyen la base a que ha de atenuerse el juez para dictar sus resoluciones y para sentenciar en definitiva con justicia 'según lo alegado y pruebas', locución análoga en el fondo."
http://www.enciclopedia-juridica.com/d/méritos-del-proceso/m...
'Con base en las pruebas, es apropiado que el reclamante esté exento del pago de honorarios or tasas de abogados, y, por lo tanto, se pasa a lo largo de su procedimiento, que, sobre el cual resulta, se puede iniciar, derivado de él ...'

English:
Legal merits are the facts and the legally documented evidence with background information relevant to the case.
https://dictionary.law.com/Default.aspx?selected=1398
'Based on the evidence, it's appropriate for the claimant to be exempt from the payment of legal fees, and, therefore, it's presently throughout the proceedings on the present claim process, that, on which it is derived, it may be initiated as a result or consequence ...'

admita al proceso - do admit to (civil) trial.

Change the word order again, plus punctuation and note the technique of such ... as for the subjunctive mood.

By dint of, stylistically, to save replication of 'as' the outcome of thereof.

(being judged?) on its merits, it is agreed to hold the plaintiff exempt from the payment of the court fee and hence, admit and proceed with all the formalities of the the present lawsuit and proceedings which will be instituted as a result of this.