Then one arose in the host of Olwë, which was ever the hindmost on the road; Lenwë he was called. He forsook the westward march, and led away a numerous people, southwards down the great river, and they passed out of the knowledge of their kin until long years were past. Those were the Nandor; and they became a people apart, unlike their kin, save that they loved water, and dwelt most beside falls and running streams. Greater knowledge they had of living things, tree and herb, bird and beast, than all other Elves. In after years Denethor, son of Lenwë, turned again west at last, and led a part of that people over the mountains into Beleriand ere the rising of the Moon.
We know what became of the other Nandor who journeyed with Lenwë's son - Denethor (who became the Green elves)
But what became of Lenwë and his people?
Was he the beginning of what is now known as the Silvan Elves?
Does "southwards down the great river" mean Lorien? (Most of the Elves who dwelt in Lorien were Silvan Elves) Was Lenwë the leader of these people until Amdír (a Noldor) came and took over as King of the Silvan Elves.
The Silvan Elves (Tawarwaith) were in origin Teleri, and so remoter kin of the Sindar, though even longer separated from them than the Teleri of Valinor. They were descended from those of the Teleri who, on the Great Journey, were daunted by the Misty Mountains and lingered in the Vale of Anduin, and so never reached Beleriand or the Sea. They were thus closer akin to the Nandor (otherwise called the Green-elves) of Ossiriand, who eventually crossed the mountains and came at last into Beleriand.
Also, when was this reuniting of kin after "long years were past"? And were all Nandor who did not cross the Misty Mountains (such as Lenwë) then called Silvan Elves?
Sorry for the multu-faceted question. Any insight would be greatly appreciated as the migration of elves can be confusing to me at times