Complex sentence: On March 30,2017, a fire started at approximately 6:15 p.m. in a storage area under the highway along Piedmont Road in the Piedmont Heights area of Midtown Atlanta, which caused the collapse of a section of I-85 northbound.
Split into simpler sentences: On March 30,2017, a fire started at approximately 6:15 p.m. in a storage area under the highway along Piedmont Road in the Piedmont Heights area of Midtown Atlanta. This caused the collapse of a section of I-85 northbound.