Complex sentence: In 1934, she assembled a number of her "Inner Light" articles on Glastonbury as "Avalon of the Heart", while further "Inner Light" articles were assembled as "Practical Occultism in Daily Life", a book aimed at a general reader.
Split into simpler sentences: In 1934, she assembled a number of her articles on Glastonbury that had been published in "The Inner Light" magazine for a publication, "Avalon of the Heart". Further "Inner Light" articles were assembled to form "Practical Occultism in Daily Life", a book aimed at a general reader.