Original sentence: The subsequent robotic Surveyor program was part of an effort to locate a safe site on the Moon for a human landing and test under actual lunar conditions the radar and landing systems required to make a true controlled touchdown
Edited sentence: Fifteen consecutive U.In stark contrast to Soviet lunar exploration triumphs in 1959, initial American efforts to reach the Moon with spacecraft were abject and humiliating failures.The American robotic Surveyor program was part of an effort to locate a safe site on the Moon for a human landing and test under actual lunar conditions the radar and landing systems required to make a true controlled touchdown.lunar missions over a seven year period from 1958 to 1964, including three attempts at the first unmanned Moon landing, all failed without a single success