Complex sentence: According to Proclamation 7320,674 plant and animal species have been identified in the Silverbell Mountains within the monument, including 64 species of mammals and 57 species of birds, although the Bureau of Land Management has been unable to verify those claims.
Split into simpler sentences: According to Proclamation 7320,674 plant and animal species have been identified in the Silverbell Mountains within the monument, including 64 species of mammals and 57 species of birds. However, the Bureau of Land Management has been unable to verify those claims.