Complex sentence: Land registration is a matter for individual states in the USA thus each state will define the officials, authorities and their functions and duties with respect to the ownership of land within that state as is more fully described in the specified main article.
Split into simpler sentences: Land registration is a matter for individual states in the USA. Thus each state will define the officials, authorities, and their functions and duties with respect to the ownership of land within that state, as is more fully described in the specified main article.