Complex sentence: The exact name of the organisation is Variety, The Chilren's Charity, however the usage of the name may differ worldwide; for instance in the USA it is known as "Variety" whereas the UK organisation is known as "The Variety Club".
Split into simpler sentences: The exact name of the organization is Variety, The Children's Charity, however the usage of the name may differ worldwide. For instance, in the USA it is known as "Variety", whereas the UK chapter is known as "The Variety Club".