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In conclusion, i'd like to say that he's a very interesting personality, first of all because of his versatility, variety of his companies and ideas.
Вполне возможно, что не совсем правильно, но я бы перевёл так.

Кстати, к личности годится больше слово "разносторонний". Разнообразную личность не представляю.

in cocclusion i will say, that he is very interesting person, firstly in his variously, various by his company and ideas.

In conclusion, I want to say that he is a very interesting personality in the first place with its diversity, the diversity of their companies and ideas.

как то так - In summary I wish to tell, that it very interesting person first of all the variety, a variety of the companies and ideas.