Major League Baseball will implement a pitch clock and ban defensive shifts beginning in the 2023 season, people familiar with the matter said, an attempt to quicken pace of play and reinvigorate offenses as a means of combating the sport’s faded appeal with fans. An 11-person joint committee that includes four active players recommended the changes. Former Chicago Cubs and Boston Red Sox executive Theo Epstein served as an adviser to the committee. The league also will increase the size of bases by three inches, a measure it believes will reduce collisions and injuries. The changes, expected to be announced...