Original sentence: As of 2006 competition thankfully has been introduced into its mobile market in Trinidad and Tobago.Digicel, whom also serve other countries in the Caribbean, began operations on their GSM network in early 2006
Edited sentence: As of 2006 competition has been introduced into its mobile market in Trinidad and Tobago.Digicel, which also serves other countries in the Caribbean, began operations on their GSM network in early 2006