This is what I think:

Your sentence is not grammatically correct and it is a run-on sentence. You cannot have two complete sentences separated by a comma. It you change your sentence to:

He said this was not an issue, and the real issue is that Mary's mother has too many children. or

He said this was not an issue. The real issue is that Mary's mother has too many children.

Then it is grammatically correct.

The first sentence is grammatically correct, and it is also look nice.

 

 

 

所有跟帖： 

• 赞！学习了，声姐解释得好。 -sportwoman- ♀ (0 bytes) () 09/25/2012 postreply 04:41:36

• My question is not answered ! How about "being"? Thanks -梦中夕阳- ♀ (0 bytes) () 09/25/2012 postreply 05:31:26

• But i got Ur Point about , and . Thank u very much ! (^o^) -梦中夕阳- ♀ (0 bytes) () 09/25/2012 postreply 05:42:02

• 回复：But i got Ur Point about , and . Thank u very much ! (^o^) -NewVoice- ♀ (3266 bytes) () 09/25/2012 postreply 06:10:15