Oh sorry i should have answered in English. "Gathering the knowledge and unite as one" doesn't really make sense as an English sentence. Rather it should be "Gathering knowledge to unite as one" (which still isn't a sentence but makes sense as a phrase) or "Gather knowledge and unite as one" (a predicate phrase). Gathering is a gerund so it acts like a noun in a sentence. If you want a full subject phrase it should be "Gathering knowledge and uniting as one." The Japanese sentence you came up with doesn't really make sense. Could you specify what you meant by the sentence?