Complex sentence: In 2004, Congress enacted a sales directive to dispose of the excess wild horses, and removed the prohibition against euthanizing healthy horses, but BLM has chosen instead to maintain the horses in long and short term holding facilities with 30,088 being held as of June 2008.
Split into simpler sentences: In 2004, Congress enacted a directive allowing sales to dispose of the excess wild horses, and removed the prohibition against euthanizing healthy horses. As a result, the BLM now maintains excess horses in long-and short-term holding facilities with 30,088 being held as of June 2008.