How to Simplify a Boolean Logic Expression with Mismatched Parentheses?

[fran1942]

Hello, I can understand most boolean simplifications however I cannot grasp this one:
(A+C+D)(A+C+'D)((A+'C+D)(A+'B)

where the ' symbol represents a NOT.

Without using Karnaugh maps can someone please tell me how to go about simplifying this expression ?

Thank you kindly for any help.

 

[NascentOxygen]

I see mismatched parentheses.

A good start would be to expand and simplify this expression: (A+C+D)(A+C+'D)

Show your working and see how far you can get.