Complex sentence: From 1973 to 1978, Conrad narrated TV nature program "The Wild, Wild World of Animals" and, in 1974, a public-service announcement about littering, for Keep America Beautiful.
Split into simpler sentences: From 1973 to 1978, Conrad narrated a nature program titled "The Wild, Wild World of Animals". In 1974, Conrad narrated a public service announcement about littering for Keep America Beautiful.