Original sentence: Clips from the Australian version were shown in the 2006 special 50 Years: 50 Stars (part of the 50th Anniversary celebrations of Australian television), which may or may not be evidence of its survival.The American series is believed to be destroyed as per network practices
Edited sentence: Clips from the Australian version were shown in the 2006 special 50 Years: 50 Stars (part of the 50th-Anniversary celebrations of Australian television), which may or may not be evidence of its survival.The American series is believed to be destroyed as per network practices of the era