Complex sentence: The scheme relied on the second digit of an area code being 0-1 and the second digit of a local exchange being 2-9; this was broken by the introduction of area code 334 and area code 360 in 1995.
Split into simpler sentences: The scheme relied on the second digit of an area code being 0-1 and the second digit of a local exchange being 2-9. This dialing plan was broken by the introduction of area code 334 and area code 360 in 1995.