Complex sentence: The area may have been named as early as the 1850s when the suburb of nearby Caversham was established and John Sidey started farming, and when tunnelling began in the 1870s further geographical interest in the area may have stimulated a naming process.
Split into simpler sentences: The area may have been named as early as the 1850s when the suburb of nearby Caversham was established and John Sidey started farming. When tunnelling began in the 1870s further geographical interest in the area may have stimulated a naming process.