Complex sentence: Allegations were made that the project would be funded by Saudi fundamentalist groups, based on Tablighi Jamaat's being a Deobandi Muslim organization that has close links with the form of the religion practiced by the Saudi royal family.
Split into simpler sentences: Allegations were made that the project would be funded by Saudi fundamentalist groups. The allegations were based on Tablighi Jamaat's being a Deobandi Muslim organization that has close links with the form of the religion practiced by the Saudi royal family.