For the second word/expression "تم افهامكم"; You can translate the idea from the context by simply saying:" Your signature present on this form means you are aware of - You have been informed - your mandatory presence before the Investigator/Detective

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Note added at 1 day 35 mins (2019-01-06 18:46:56 GMT)
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Hello again,

Regarding your question about whether "المحقق" here could be translated into the "Judge", it depends on the document you are working on. I understand that due to confidentiality reasons you are not allowed to say what you are working on, but you can tell what is meant by it according to the context in which this document is in.

Good luck!