Simplify the following text for a Grade 13 native English-speaking person.
Original: However , Ralph Molnar in 2004 determined a range of potential sizes for Megalania ( made by scaling up from dorsal vertebrae , after he determined a relationship between dorsal vertebrae length and total body length ) .
Simplified: Ralph Molnar in 2004 determined a range of potential sizes for Megalania ( made by scaling up from dorsal vertebrae , after he determined a relationship between dorsal vertebrae length and total body length ) .