First, stop using sysinstall after the OS is installed.
Second, you will have to delete one of your primary partitions and replace it with an extended partition that covers all the free space. Then you can create logical partitions inside that extended partition.
To do this without losing data (or doing a proper backup & reinstall) will require using partitioning tools like parted/gparted/qtparted, Partition Magic, and so on.
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