MacKenzie Scott, the philanthropist and ex-wife of Amazon founder Jeff Bezos, announced that she’s making a new round of donations to charity. MacKenzie, who is now married to Dan Jewett after her 25-year-old marriage to Amazon CEO crashed, made the announcement Tuesday, June 14, in a Medium blog post. Scott and her husband Dan Jewett, donated $2.74 billion to 286 organizations that focus on the arts and combating racial discrimination. This marks Scott’s third major round of donations. …