Complex sentence: Additional adjacent lands were added, and for many years, the park's size stood at 13,000 acres (53 km²) indeed, many currently available state road maps still show the park in its 13,000 acre (53 km²) configuration.
Split into simpler sentences: Additional adjacent lands were added, and for many years, the park's size stood at 13,000 acres (53 km²). Indeed, many currently available state road maps still show the park in its 13,000 acre (53 km²) configuration.