Complex sentence: Assuming that Portsmouth aren't wound up over the summer off-season they will have a difficult campaign ahead of them, however with current manager Michael Appleton expressing a desire to stay, things could be a lot easier for Portsmouth.
Split into simpler sentences: Assuming that Portsmouth aren't wound up during the summer off-season, they will have a difficult campaign ahead of them. However, with current manager Michael Appleton expressing a desire to stay, things could be a lot easier for Portsmouth.