Complex sentence: The performance (speed) of ext3 is less attractive than competing Linux filesystems, such as ext4, JFS, ReiserFS, and XFS, but ext3 has a significant advantage in that it allows in-place upgrades from ext2 without having to backup and restore data.
Split into simpler sentences: The performance (speed) of ext3 is less attractive than competing Linux filesystems, such as ext4, JFS, ReiserFS and XFS. But ext3 has a significant advantage in that it allows in-place upgrades from ext2 without having to backup and restore data.