Complex sentence: Born in Torrent, Valencian Community, Guaita was a Valencia CF youth system graduate, being promoted to the first team for the 2008--09 season following the retirement of historical Santiago Cañizares.
Split into simpler sentences: Born in Torrent, Valencian Community, Guaita was a Valencia CF's youth system graduate. He being promoted to the first team for the 2008--09 season following the retirement of historical Santiago Cañizares.