Complex sentence: By the end of the year 2000 this system had reached the end of the alphabet ("ZZ ")-the official last plate in the format was"ZZ9989 "-the sequence"ZZ999Ø " to"ZZ9999" appeared as personalised plates years earlier.
Split into simpler sentences: By the end of the year 2000 this system had reached the end of the alphabet ("ZZ "). The series officially ended with plate"ZZ9989 "-the sequence"ZZ999Ø " to"ZZ9999" had appeared as personalised plates years earlier.