Sony on Tuesday announced that it will lay off about 900 employees in its PlayStation unit, or 8% of its global workforce. “These decisions have been extremely difficult, but they are necessary, and I think it’s important to be transparent,” said Hermen Hulst, head of PlayStation Studios. “After careful consideration and many leadership discussions over several months, it has become clear changes need to be made to continue to grow the business and develop the company,” Sony Interactive Entertainment CEO Jim Ryan said in an email to employees, released publicly by the company. He added that em…