Complex sentence: Anime fans and sympathisers used the Internet to raise funds and lodge a legal challenge to Odex's methods; one Internet user created an invitation-only forum for those considering going to court against Odex over its allegations of illegal downloads.
Split into simpler sentences: Anime fans and sympathisers used the Internet to raise money and lodge a legal challenge to Odex's methods. An Internet user created an invitation-only forum for those considering going to court against Odex over its allegations of illegal downloads.