Complex sentence: The creepers completely cover several hectares of the forest floor and tree trunks, smothering all native species, and are gradually spreading further, and were even planted along the banks of roads elsewhere in the forest, posing a great threat to the biodiversity of the forest.
Split into simpler sentences: The creepers completely cover several hectares of the forest floor and tree trunks, smothering all native species, and are gradually spreading further. Recently they were even planted along the road banks elsewhere in the forest, posing a great threat to the biodiversity of the forest.