Complex sentence: The wave gradually developed over the next several days and was determined to have become a tropical depression and was given the number Two-E on June 21 while located 385 mi (620 km) south of Zihuatanejo, Guerrero, Mexico.
Split into simpler sentences: The wave gradually developed over the next several days and was determined to have become a tropical depression. The storm was given the number Two-E on June 21 while located 385 mi (620 km) south of Zihuatanejo, Guerrero, Mexico.