However, in December 1997 the Earth moved to the opposite side of the Sun from Uranus, and thus our view of the planet and its moons was blocked until spring 1998.
(the Earth; moved; to the opposite side of the Sun; from Uranus; T:in December 1997) (our view of the planet and its moons; was blocked; T:until spring 1998)
the Earth our view of the planet and its moons
moved was blocked
to the opposite side of the Sun from Uranus T:in December 1997
T:until spring 1998