Complex sentence: The United Church of Northern India-Presbyterian Synod was once part of the Church of North India, but decided to seceed in 1994, because they felt that the Church of North India was too centralised.
Split into simpler sentences: The United Church of Northern India-Presbyterian Synod was once part of the Church of North India. They decided to seceed in 1994, because tey felt that the Chuexh of Nort India is too centralised.