from keras.preprocessing.text import text_to_word_sequence
# define
text = """Founded in 2002, SpaceX’s mission is to enable humans to become a spacefaring civilization and a multi-planet
species by building a self-sustaining city on Mars. In 2008, SpaceX’s Falcon 1 became the first privately developed
liquid-fuel launch vehicle to orbit the Earth."""

# tokenize
result = text_to_word_sequence(text)

#removing stopwords
new_sent = [word for word in result if word not in stopwords.words("english")]
result1 = ' '.join(new_sent)

print(result1)