Complex sentence: The next member of the club to become eligible for the Hall is Roger Clemens, who is expected to become eligible during the 2013 balloting; however, his election is seen as uncertain because of his alleged links to use of performance-enhancing drugs.
Split into simpler sentences: The next member of the club to become eligible for the Hall is Roger Clemens, who is expected to become eligible during the 2013 balloting. However, his election is seen as uncertain because of his alleged links to use of performance-enhancing drugs.