Complex sentence: Adult development and maturity theories include the purpose in life concept, in which maturity emphasizes a clear comprehension of life's purpose, directedness, and intentionality which, contributes to the feeling that life is meaningful.
Split into simpler sentences: Adult development and maturity theories include the purpose in life concept. Maturity emphasizes a clear comprehension of life's purpose, directedness, and intentionality which, contributes to the feeling that life is meaningful.