Complex sentence: In 2010, the Go-Go's announced their "Happily Ever After Farewell Tour" to be held in July, only to later cancel the remainder of the tour due to ACL tears in both knees Wiedlin suffered in a fall while on a nighttime hike.
Split into simpler sentences: In 2010, the Go-Go's announced their "Happily Ever After Farewell Tour". Although scheduled to begin in July, the tour was cancelled due to ACL tears Wiedlin suffered in both knees after a fall she took while on a nighttime hike.