The competition for available sunlight, nutrients and water will reduce the re-establishment of the undesirable species once these have been removed.
(The competition for available sunlight, nutrients and water; will reduce; the re-establishment of the undesirable species; T:once these have been removed) (these; have been removed; )
The competition for available sunlight, nutrients and water these
will reduce have been removed
the re-establishment of the undesirable species T:once these have been removed