Complex sentence: USS "Mahanna" (AG-8) was a "Mahanna"-class cargo ship acquired by the U.S. Navy for use as a miscellaneous auxiliary cargo ship to be used for transporting general stores to Navy units in the field.
Split into simpler sentences: USS "Mahanna" (AG-8) was a "Mahanna"-class cargo ship. She was acquired by the U.S. Navy as a miscellaneous auxiliary cargo ship, to be used for transporting general stores to Navy units in the field.