Complex sentence: Liftoff took place at 3:12 AM EST on November 18 and once again all went well up until the planned Agena restart, which ended for the second time in a row with a burn lasting a few seconds.
Split into simpler sentences: Liftoff took place at 3:12 AM EST on November 18. When it came time for the second Agena restart, the result was once again a burn lasting a few seconds.