This is how I would translate your sentence:

"The Director herein appointed, present at the meeting, stated explicitly, for all purposes and under penalty of law that he is not prevented by special law, to manage the company."

"sociedade" here in this business context could be any of the following:

Sociedade anônima
Sociedade de economia mista
Sociedade em comandita simples
Sociedade limitada
Sociedade por quotas de responsabilidade limitada

and therefore the more generic term "company" applies here.