Complex sentence: Because of lack of technological advancement of Urdu in early days so an informal system of Roman Urdu was developed by the users so to use Urdu on the Internet and on Mobile Phones similar to that used by Hindi speakers.
Split into simpler sentences: Because of lack of technological advancement of Urdu in early days. An Informal System of Roman Urdu was used on the Internet and on Mobile Phones similar to that used by Hindi speakers.