Complex sentence: On 24 March 2010, Gates termed the cost overruns and delays as "unacceptable" in a testimony before the U.S. Congress; and characterized previous cost and schedule estimates as "overly rosy".
Split into simpler sentences: On 24 March, Gates termed the cost overruns and delays as "unacceptable" in a testimony before the U.S. Congress. He characterized previous cost and schedule estimates for the project as "overly rosy".