Complex sentence: Upon becoming a tropical cyclone, tropical cyclone warnings and watches were issued for a portion of the Pacific coast of Mexico; a tropical storm warning was issued from Zihuatanejo to Punta San Telma while a tropical storm watch was in effect from Punta San Telma to Manzanillo.
Split into simpler sentences: Upon becoming a tropical cyclone, tropical cyclone warnings and watches were issued for a portion of the Pacific coast of Mexico. A tropical storm warning was issued from Zihuatanejo to Punta San Telma while a tropical storm watch was in effect from Punta San Telma to Manzanillo.