8 Answers

the researcher with all his assistants explain such claim to be true

What a truly horrible "sentence".  Beyond the fact that it is not grammatically correct, it doesn't make much sense, either.  
The researcher, along with his assistants, explained the claim was true. (Still too weird) 

What are you talking about ?

It's grammatical, for the most part, but it's poorly worded. The syntax is off, and some of the punctuation is missing.

You could say something like,   ........The researcher, with the help of his assistants, explained how this claim is true.

ungrammatical

....researcher, with all his assistants, explains

Ungrammtical

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