I am quite a beginner; it is not clean clode but works
number_of_words = 10
sentence = sentence.split(/\n/m).join(" ")
sentence.gsub!(" "," ")
r = /.*?[.!?](?:\s|$)/
sentences = sentence.scan(r)
sentences.map! {|e| e.split}
v = []
sentences.each do |e|
while !e.empty?
vv = []
number_of_words.times {vv << (e.shift.to_s + " ")}
v << vv
end
end
v.each {|e| e.delete_if {|x| x == " "}}
v.map! {|e| e.join}
v.each {|e| p e}
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