Complex sentence: IPv4 address exhaustion occurred on February 3,2011, although it had been significantly delayed by address changes such as classful network design, Classless Inter-Domain Routing, and network address translation (NAT).
Split into simpler sentences: IPv4 address exhaustion occurred on February 3,2011. It had been significantly delayed by address changes such as classful network design, Classless Inter-Domain Routing, and network address translation (NAT).