Complex sentence: This is in stark contrast to the rest of the village where the ground is made of white sand where, till the developments of late 1990s, large amounts of a medicinal herb with white flowers called "Thumba" grew in abundance, hence the name.
Split into simpler sentences: This is in stark contrast to the rest of the village where the ground is made of white sand. Till the developments of late 1990s, much of the Thumba consisted of white sand where a medicinal herb with white flowers called "Thumba" grew in abundance, hence the name.