Complex sentence: Over the centuries there may have been a gradual accretion of stories about Gilgamesh, some possibly derived from the real lives of other historical figures, in particular Gudea, the Second Dynasty ruler of Lagash (2144--2124 BC).
Split into simpler sentences: Over the centuries there may have been a gradual accretion of stories about Gilgamesh, some possibly derived from the real lives of other historical figures. This could include in particular Gudea, the Second Dynasty ruler of Lagash (2144--2124 BC).