Complex sentence: Lamarck's first law asserts that a past of indefinite duration cannot create a bias by which the present can be controlled: despite long-established conditions and correspondingly evoked characters, new conditions will cause new responsive characters.
Split into simpler sentences: Lamarck's first law asserts that a past of indefinite duration cannot create a bias by which the present can be controlled. He declares that despite long-established conditions and correspondingly evoked characters, new conditions will cause new responsive characters.