Complex sentence: The company's leader has evolved throughout his career opportunities, at places such as Guess and then eventually starting Seven for all Mankind, once realizing that Seven was not the place where his ambitions were going to be successful he created Citizens of Humanity.
Split into simpler sentences: The company's leader has evolved throughout his career opportunities, at places such as Guess and then eventually starting Seven for all Mankind. Upon realizing that Seven was not the place where his ambitions were going to be successful, he created Citizens of Humanity.