Complex sentence: At the same time, two factors compounded the unwillingness of IPR owners to donate their materials: full texts were to be excluded, and there was no motivation for them to disseminate information using the corpus, particularly since the corpus operates on a non-commercial basis.
Split into simpler sentences: At the same time, two factors compounded the unwillingness of IPR owners to donate their materials. Firstly, full texts were to be excluded; and secondly, there was no motivation for them to disseminate information using the corpus, particularly since the corpus operates on a non-commercial basis.