Task: Text Simplification
Input (English): altogether , the constellation contains about 50 galaxies observable through amateur telescope.
Output (English): in total , the constellation -lrb- a group of stars forming a recognizable pattern -rrb- contains about 50 galaxies -lrb- a system of millions or billions of stars , together with gas and dust , held together by gravitational attraction -rrb- can be seen through amateur telescope -lrb- device used to view the most farthest objects which could not be viewed with naked eye -rrb-.