Complex sentence: IPv4 addresses are in the range from 169.254.1.0 to 169.254.254.255 when no other IP addressing assignment is available, e.g. no connectivity to a DHCP server.
Split into simpler sentences: IPv4 addresses are in the range from 169.254.1.0 to 169.254.254.255. When a no other IP addressing assignment is available, e.g. no connectivity to a DHCP server.