Complex sentence: In December 2014, a new species of snailfish was discovered at a depth of, breaking the previous record for the deepest living fish seen on video, and extended in May 2017 when another unidentified type of snailfish was filmed at a depth of.
Split into simpler sentences: In December 2014, a new species of snailfish was discovered at a depth of, breaking the previous record for the deepest living fish seen on video. In May 2017 another unidentified type of snailfish was filmed at a depth of.