That plastic line is crap. Replace it with silicone. In the mean time, you can splice it with rubber line unless it goes over a really hot spot in the engine. You'll want to get this taken care of as it will probably cause a DTC to light your CEL.
You'll want to replace it eventually. For now, just buy a bit of rubber vac line. Take the broken ends and snap them off. Keep snapping until you find where it's not brittle anymore. If you find you're snapping off more than an inch, stop. Probably the whole length is like that. Put the new line across the missing part.
Search this forum for silicone and you'll find everything you need to replace them.