whom I know and who is legally competent
Explanation:
The CONTEXT is insufficient and I would especially like to see what comes immediately before, but more or less it should go like this:
...compareció Pablo Pérez García, (siendo de mi conocimiento y con capacidad legal, lo que certifico y quien bajo protesta de decir verdad DECLARÓ...)
...whom I know and who is legally competent, to which I am certifying, and who STATED under oath to tell the truth...
| Henry Hinds
Local time: 20:28
Works in field
Native speaker of:  English, Spanish
PRO pts in category: 625
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The translation workplace 
peer agreement (net): +4
