Complex sentence: Marie originated from a easterly wave that crossed the coast of Africa on September 6th the wave traveled quickly westward across Atlantic but showing no sign of organization until it reached Central America about two weeks later, and reaching Pacific on the 24th.
Split into simpler sentences: Marie originated from a easterly wave that crossed the coast of Africa on September 6th. The wave traveled quickly westward across Atlantic but showing no sign of organization until it reached Central America about two weeks later, and reaching Pacific on the 24th.