Cristiano Ronaldo on Wednesday vowed to help Manchester United win major trophies again, calling his return to the club “the best decision” and the beginning of a new chapter. The Portugal forward sealed a move back to United, where he previously spent six seasons between 2003–09 and won eight major honors, from Juventus this week on a two-year deal with the option of an additional year. “I think it’s the best decision that I have made. It’s right on point in my opinion … I want to carry on again, to make history, to try to help Manchester achieve great results, to win trophies and number one of them, to win great things,” the 36-year-old told the club website. Ronaldo said that Alex Ferguson, the former United manager who first signed him as an 18-year-old from Sporting Lisbon in 2003, played a big role in the player coming back to …