Complex sentence: A region of significant tectonic activity has developed in the Jamuna River associated with Himalayan uplift and development of the Bengal foredeep, several researchers has hypothesized that the underlying structural control on the location of the major river systems of Bangladesh.
Split into simpler sentences: A region of significant tectonic activity, it has developed in the Jamuna River and is associated with the Himalayan uplift and development of the Bengal foredeep. Several researchers has hypothesized that the underlying structural control on the location of the major river systems of Bangladesh.