Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_50 (date_from VARCHAR, position VARCHAR, name VARCHAR)

### Question ###
What is the date for the MF position and player Jennison Myrie-Williams?

### Accurate SQL ###

SELECT date_from FROM table_name_50 WHERE position = "mf" AND name = "jennison myrie-williams"