Original sentence: Moreover, the cost of telephone calls has diminished to the point where few would find it worthwhile to engage in toll fraud; and there are numerous competing providers of telephone service (except for most wired local service which remains controlled by regional Bell operating companies—remnants of the former AT&T monopoly).Other reasons why many people attempted (or succeeded in) phone phreaking during the 1960s and 1970s included the (then) very high cost of long-distance telephone service, and a desire to rebel against the former AT&T telephone monopoly
Edited sentence: Moreover, the cost of telephone calls has diminished to the point where few would find it worthwhile to engage in toll fraud; and there are numerous competing providers of telephone service (except for most wired local service which remains controlled by regional Bell operating companies -- remnants of the former AT&T monopoly).Other reasons why many people attempted (or succeeded in) phone phreaking during the 1960s and 1970s included the (then) very high cost of long-distance telephone service, and a desire to rebel against the hated, former AT&T telephone monopoly