Complex sentence: After Major became Prime Minister, it was misreported that he had failed to get a job as a bus conductor because of failing a maths test, when in fact he passed all of the tests, but had been passed over owing to his height.
Split into simpler sentences: After Major became Prime Minister it was misreported that his failure to get a job as a bus conductor owed to his failing of a maths test. He had in fact passed all of the tests but had been passed over owing to his height.