Complex sentence: In 1986 he saw Paco de Lucía at a concert in Russia at the peak of his career which he says "blew his mind" and was "absolutely amazing"; it was a massive influence on him and a turning point in his life.
Split into simpler sentences: In 1986 he saw Paco de Lucía at a concert in Russia at the peak of his career which he says "blew his mind" and was "absolutely amazing". It was a massive influence on him and a turning point in his life.