Complex sentence: Hyacinth boasts about the "psychic" closeness of their relationship and how often he writes to her and phones her, although he never writes to her and usually phone calls her only to ask for money (much to the despair of Richard).
Split into simpler sentences: Hyacinth boasts about the "psychic" closeness of their relationship and how often he writes to her and phones her. However, he never writes to her and his phone calls to her are usually only to ask for money (much to the despair of Richard).