Complex sentence: The woodland has suffered bigger alterations, since most autochthonous species like the common fig or the pyrenaean oak (Quercus pyrenaica) are now reduced to symbolic representation by the reforestation of nearly one fourth of the surface with pine trees and eucalyptus.
Split into simpler sentences: The woodland has suffered bigger alterations, since most autochthonous species like the common fig or the pyrenaean oak (Quercus pyrenaica) are now reduced to symbolic representation. The reforestation of nearly one fourth of the surface with pine trees and eucalyptus.