Complex sentence: When Glenda intends to take custody of Matthew, Danny tells Jack that he can get Glenda to change her mind in exchange for £20,000, so Jack attacks Danny shortly before Glenda tells Jack that she is not doing it for financial gain.
Split into simpler sentences: When Glenda intends to take custody of Matthew, Danny goes to to tell Jack that he can get Glenda to change her mind in exchange for £20,000. However Jack beats Danny up shortly before Glenda tells Jack that she is not doing it for financial gain.