Simplify the following text for a Grade 6 native English-speaking person.
Original: During 1934 and 1935 he was for some time in Britain , delivering the Gifford Lectures at Edinburgh University , and those on Religion in Modern Civilization at Oxford and London . He had originally conducted trials for recordings for HMV on the organ of the old Queen 's Hall in London .
Simplified: Between 1934 and 1935 , he had a trial recording for HMV on the organ of the old Queen 's Hall in London .