Complex sentence: Later on, shark researchers (including Pimiento, Ehret and MacFadden) revisited Gatun Formation and recovered additional specimens, the specimen number 257579 yielded a total length of on the basis of Shimada's method.
Split into simpler sentences: Later on, shark researchers (including Pimiento, Ehret and MacFadden) revisited the Gatun Formation and recovered additional specimens. Specimen number 257579 yielded a total length of on the basis of Shimada's method.