Complex sentence: His record, however, is forever confined to its era since the pitcher's mound was only from the batter during that season; it was moved to its current distance of 60' 6 in 1893.
Split into simpler sentences: His record, however, is forever confined to its era since the pitcher's mound was only from the batter during that season. It was moved to its current distance of 60' 6 in 1893.