Complex sentence: The descriptive name Saddle Island was given for this feature, probably by a British expedition under Ernest Shackleton, 1921--22, but the same name is used elsewhere in the Antarctic; to avoid confusion a new name has been approved for this feature.
Split into simpler sentences: The descriptive name Saddle Island was given for this feature, probably by a British expedition under Shackleton, 1921--22, but the same name is used elsewhere in the Antarctic. To avoid confusion a new name has been approved for this feature.