It is said that a person can choose to return to samsara to help others after being reborn in Pure Land. But has anyone claimed to be that particular kind of person? I am not talking about those who claimed to have visited Pure Land in meditation or dreams. But those who was a human, rebirthed in a Pure Land, instructed by Buddhas and bodhisattvas in that Pure Land, then chose to rebirth back as human on earth to help other beings.
Usually the Bodhisattvas who vows to be born back to Earth to guild others will do so with the means appropriate to the culture, time and age. In this age of Dharma descend, they would not display enlightenment or supernatural powers, but instead would display mindfulness of Amitabha Buddha and recitation of His name. They would show signs that they obtain rebirth to Pureland. And they will never reveal their true identity. Master Chin King often said if the Buddha or Bodhisattva identity is revealed they would immediately depart from this world. Namo Amita Buddha.
I guess technically the Dalai Lama be one such person. He is reputedly the manifestations of the bodhisattva of compassion, Avalokiteśvara. Avalokiteśvara is the the earthly manifestation of Amitabha who has the Pureland of sukhavati. Amitabha is himself the primary focus of Pure Land Buddhism. I'm not sure if the Dalai Lama would stand up in from of an audience and make that claim but he is an emanation of a bodhisattva who is associated with a pure land.
I am not aware of anybody who has chosen to reenter samsara after having died in a previous life and being reborn in Sukhavati. Perhaps it is a rare event that has not happened yet since the death of Sakyamuni. Or perhaps it simply means that the appearance of buddhas from the Pureland is not a matter of incarnation, but a matter of influence. Personally, I am more interested in the bodhisattva that can reach into samsara to save sentient beings while remaining in sukhavati.