Complex sentence: Many people are offering this type of connection (as a cheap way of fitting an installation) on new more advanced cars, this results in any modern advanced safety systems staying dormant and ineffective as they have not been activated.
Split into simpler sentences: Many people are offering this type of connection (as a cheap way of fitting an installation) on new more advanced cars. This results in any modern advanced safety systems staying dormant and ineffective as they have not been activated.