Complex sentence: The icefalls extend southwest from Mount Massam to Vance Bluff, and were named in honor of A. W. Black, a member of the 1959 Cape Hallett winter-over team, working as a technician on the geomagnetic project.
Split into simpler sentences: The icefalls extend southwest from Mount Massam to Vance Bluff. Named in honor of A. W. Black, a member of the 1959 Cape Hallett winter-over team, working as a technician on the geomagnetic project.