The partitions on a dynamic disks should be deteced automatically by the kernel if the support is compiled in, and you should be able to mount them like you do with normal partitions.
If the kernel has support you should see messages like this in dmesg:
hda: 102400 sectors w/32KiB Cache, CHS=50/64/32
hda: [LDM] hda1 hda2 hda3 hda4 hda5 hda6 hda7
if not then you need to recompile your kernel, adding the support