Complex sentence: Though convinced by Grünbaum's criticism of hermeneutic interpretations of psychoanalysis, he criticized Grünbaum's obscure and frustrating presentation of his views and poor writing, and rejected Grünbaum's view that it is important to establish a criterion to distinguish between scientific and unscientific statements.
Split into simpler sentences: Though convinced by Grünbaum's criticism of hermeneutic interpretations of psychoanalysis, he criticized Grünbaum's obscure presentation of his views and poor writing. He rejected Grünbaum's view that it is important to establish a criterion to distinguish between scientific and unscientific statements.