Repartition 1Tb drive

I'm trying to repartition an old 1Tb drive from an old windows machine
I want a single partition, currently it has:
/dev/sdc1 ext4 97GiB
/dev/sdc2 extended 833.86GiB
unallocated 1.65MiB
/dev/sdc5 ext4 833.85GiB
unallocated 2.49MiB

I'm using Gparted but I cannot figure out how to get rid of the unallocated partition, they're too small to format, and I cannot move or resize across those boundaries.
Stumped!
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