Complex sentence: At the tender age of 25, and only 27 at bats under his belt, he is hardly worth picking up in a fantasy league, but the second year, left fielder shows a lot of potential.
Split into simpler sentences: At the tender age of 25, and just 27 at bats under his belt, he is but hardly worth fantasy baseball attention. But, the second year, left fielder shows a lot of potential.