In addition, a sediment delta that had formed at the site's discharge point to the river was removed, helping to restore the hydrological conditions in that stretch of the river.
(a sediment delta; had formed; T:at the site's discharge point to the river) (a sediment delta that had formed at the site's discharge point to the river; was removed; )
a sediment delta a sediment delta that had formed at the site's discharge point to the river
had formed was removed
T:at the site's discharge point to the river