Complex sentence: Monodominant species have been recorded forming at various times after forest clearance, and this has not been shown to be a predictor of monodominant species persistence; reliance upon ectomycorrhizae and poor soils have not been demonstrated.
Split into simpler sentences: Monodominant species have been recorded forming at various times after forest clearance, though this has not been shown to be a predictor of monodominant species persistence. Reliance upon ectomycorrhizae and poor soils have not been demonstrated.