Original sentence: In the early 1950s, he began to learn about ceramics from a Czechoslovakian technician who was employed by “Industrias Cerámicas Unidas”.Today there is an exhibit of his ceramic work and that of other very well known Cuban painters at the Castillo de la Fuerza museum in “old Havana
Edited sentence: In the early 1950s, he began to learn about ceramics from a Czechoslovakian technician who was employed by "Industrias Cerámicas Unidas".Today there is an exhibit of his ceramic work and that of other very well known Cuban painters at the Castillo de la Fuerza museum in "old Havana