Simplify the following text for a Grade 10 native English-speaking person.
Original: It was not until 1925 that the British Foreign Secretary Sir Austen Chamberlain officially admitted that the `` corpse factory '' story had been an error .
Simplified: It was not until 1925 that the British Foreign Secretary Sir Austen Chamberlain officially said that the `` corpse factory '' story had been an error .