As I mentioned previously (www.sqlservercentral.com/Forums/Topic1407762-391-1.aspx)
You'd have to restore the primary filegroup backup, the the secondary, then all the log backups since the oldest of those 2 backups to bring the DB to a consistent point
You can't restore parts of a database to one time and parts to some other time. A database has to be all at one point in time.
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability