Which of these is a simple sentence?
immigrants who came to work in factories lived in urban neighborhoods.
“old” immigrants often settled on farms, but most “new” ones lived in cities.
in the past, many immigrants had come from northern and western europe.
immigrants worked long hours and faced crowded living conditions.

Can you summarize this? it takes time and caution to perfect anything which must be concealed. it takes time to crush men who are pursuing legitimate trade. but one of mr. rockefeller’s most impressive characteristics is patience. there never was a more patient man, or one who could dare more while he waited. the folly of hurrying, the folly of discouragement, for one who would succeed, went hand in hand. everything must be ready before he acted, but while you wait you must prepare, must think, work. "you must put in, if you would take out." his instinct for the money opportunity in things was amazing, his perception of the value of seizing this or that particular invention, plant, market, was unerring.