Among players who were born after 1950, who had offence rebounds rates more than 30%? Please list their last names and first names.
born after 1950 refers to birthDate > = '1950-01-01'; offence rebound rate more than 30% refers to Divide (oRebounds, rebounds) > 0.3
SELECT DISTINCT T1.lastName, T1.firstName FROM players AS T1 INNER JOIN player_allstar AS T2 ON T1.playerID = T2.playerID WHERE T1.birthDate > 1950 AND CAST(T2.o_rebounds AS REAL) * 100 / T2.rebounds > 30