Complex sentence: The most widely known (although rudimentary) string metric is Levenshtein Distance (also known as Edit Distance), which operates between two input strings, returning a score equivalent to the number of substitutions and deletions needed in order to transform one input string into another.
Split into simpler sentences: The most widely known string metric is a rudimentary one called the Levenshtein Distance (also known as Edit Distance). It operates between two input strings, returning a score equivalent to the number of substitutions and deletions needed in order to transform one input string into another.