Original sentence: In 1965, membership in the Corps of Cadets became voluntary for students at Texas A&M.In 1969, the stack of logs set the world record at 109 ft, 10 in (30 m) tall.The stack they built that year was willingly dismantled for the first time in Aggie history
Edited sentence: In 1969, the stack of logs set the world record at   tall.In the 1960s, membership in the Corps of Cadets became voluntary for students at Texas A&M.Unfortunately, the stack they built that year was willingly dismantled for the first time in Aggie history