A mysterious Saudi-based investor has plowed millions of dollars into a British news organization renowned for championing liberal causes, in a move that will enrage human rights and media freedom campaigners. Sultan Mohamed Abuljadayel, 42, listed in company records as a Saudi-based Saudi Arabian national, has acquired up to 50 percent of the Independent website, whose newspaper shook Britain’s journalism establishment in the 1980s before struggling financially and ditching the printed word in 2016.