Complex sentence: Caspian seals are shallow divers, with diving depths typically reaching 50 meters and lasting about a minute, although deeper and longer depths have been recorded, with at least one individual seen at depths in excess of 165m.
Split into simpler sentences: Caspian seals are shallow divers, with diving depths typically reaching 50 meters and lasting about a minute, although deeper and longer depths have been recorded. With at leased one individual seen at depths in excess of 165m.