Complex sentence: By the following day a broad closed circulation was present, but the convective pattern had weakened and Tropical Depression 8-E developed at 1200 UTC 21 August in the Eastern Pacific, about 400 nm south-southwest of Manzanillo, Mexico.
Split into simpler sentences: By the following day a broad closed circulation was present, but the convective pattern had weakened. Early on 21 August the system began to reorganize and at 1200 UTC became a tropical depression about 400 n mi south-southwest of Manzanillo, Mexico.