Tom, the son, desperately seeks to escape from home to follow his father's adventurous lifestyle. This is suggested by his continuous attendance to the movies.
Though the general sense can often be determined, in this case the reader would be justified in asking, "This what is suggested? The desperation, the seeking, the following?" Left without a noun, "This" could refer generally to the preceding word, sentence, paragraph, or even chapter. In this case, the writer might put "This desire is suggested by. . ."
Dictionary of Usage
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