Complex sentence: In 1966, he issued a freeze on state land selections, and later issued the Deep Freeze in 1969, which declared ninety percent of the state off limits to any form of federal land transfer.
Split into simpler sentences: In 1966, he issued a freeze on the state land selections. He also issued the Deep Freeze in 1969, which declared ninety percent of the state off limits to any form of federal land transfer.