Simplify the following text for a Grade 6 native English-speaking person.
Original: The first occurrence of this was in 1932 , 1933 , and 1934 , and the second occurrence were the years of 1951 , 1952 , and 1953 .
Simplified: The first time this event happened was in 1932 , 1933 , and 1934 ; the second time it happened was in 1951 , 1952 , and 1953 .