The usage of commas with the word "additionally"

The sentence does have problems but I am not sure that "additionally" is the significant one. In your sentence, "additionally" is a free modifier that fronts the clause, "conducted a lot of well-organized sports clubs." As, for example, in "Unfortunately, you have lost."

Fronting free modifiers are usually offset with a comma or commas.

In short, I would keep the comma.