Complex sentence: Kirsty returns home mid-shift to check on Warren, who at this points seems to be suffering from myalgic encephalomyelitis leaving him unable to work, and it appears the bruises come from helping her husband stand up.
Split into simpler sentences: Kirsty returns home mid-shift to check on Warren, who seems to be suffering from myalgic encephalomyelitis, leaving him unable to work. It also appears the bruises come from helping her husband to stand up.