Complex sentence: There have been claims that there is a third component orbiting star B with a period of 25.5 years; but it is possible that this is simply an over-interpretation of residuals, as has been the case with other perceived third components of binary systems.
Split into simpler sentences: There have been claims that there is a third component orbiting star B with a period of 25.5 years. But, it is possible that this is simply an over-interpretation of residuals, as has been the case with other perceived third components of binary systems.