Complex sentence: Boucher is currently South Africa's first-choice wicketkeeper, and is widely regarded as one of, if not the, greatest wicketkeepers South Africa has ever had, and holds the record for the most dismissals in Test cricket.
Split into simpler sentences: Boucher is currently South Africa's first-choice wicketkeeper, and is widely regarded as one of, if not the, greatest wicketkeepers South Africa has ever had. He holds the record for the most dismissals in Test cricket.