Short answers, pulled from the story.
Sonam Gyaltsen Lakar arrived in the Trehor region of Kham, Tibet, during 1947. His mother identified him as a significant figure when Jamyang Khyentse Chökyi Lodrö recognized him as the incarnation of Tertön Sogyal.
Sogyal Rinpoche began teaching in London during 1974 from a house called Orgyen Chöling which later changed to Dzogchen Orgyen Chöling. By 2017 over 100 Buddhist centers existed in 23 countries worldwide including locations like Rue Burq Paris opened in 1978 and retreats in Tiona Park Australia beginning in 1989.
The Tibetan Book of Living and Dying launched in the United States in September 1992 and spent several weeks atop bestseller lists according to The New York Times Book Review. More than two million copies have been printed in 30 languages and 56 countries since then making it a global phenomenon covering themes of dying and spiritual practice.
A $10 million civil lawsuit was filed against Sogyal Rinpoche in 1994 with allegations claiming he used his position to induce sexual relations with a female student. The complaint included accusations of emotional distress breach of fiduciary duty assault and battery before settling out of court without public trial details.
On the 11th of August 2017 Sogyal retired immediately as spiritual director from all organizations bearing the name Rigpa following an eight-page letter sent by senior students on the 14th of July 2017 detailing abuse. The Dalai Lama addressed misconduct at a conference in Ladakh India on the 1st of August 2017 calling him disgraced.