Complex sentence: The abuse of the monument continued until renewed restoration efforts began in the early 1990s; in 1991, Frank Scaturro, a student at Columbia University, launched an effort to restore the tomb and brought his concerns to Congress.
Split into simpler sentences: The abuse of the monument continued until renewed restoration efforts began in the early 1990s. In 1991, Frank Scaturro, a student at Columbia University, launched an effort to restore the tomb and brought his concerns to Congress.