Complex sentence: In 2005, Funimation's legal department began to pursue a more aggressive approach toward protecting the company's licensed properties, and started sending "cease and desist" (C&D) letters to sites offering links to fansubs of their titles.
Split into simpler sentences: In 2005, Funimation's legal department began to pursue a more aggressive approach toward protecting the company's licensed properties. Then started sending "cease and desist" (C&D) letters to sites offering links to fansubs of their titles.