The analysis, published by several researchers at Yale and Stanford,
shows that the recently discovered individual belonged to a previously unknown human lineage, a group that split off from other Native Americans just after — or perhaps just before — they arrived in North America.
(A) shows that the recently discovered individual belonged to a previously unknown human lineage, a group that split off from other Native Americans just after — or perhaps just before — they arrived
(B) shows the recently discovered individual belonged to a previously unknown human lineage and was a group that split off from other Native Americans just after — or perhaps just before — arriving
(C) shows that the recently discovered individual belonged to a previously unknown human lineage, which was a group that split off from other Native Americans just after — or perhaps just before — and arrived
(D) show that the recently discovered individual belonged to a previously unknown human lineage, a group splitting off from other Native Americans just after — or perhaps just before — arriving
(E) show that the recently discovered individual belonged to a previously unknown human lineage, which was a group that split off from other Native Americans just after — or perhaps just before — they arrived