Complex sentence: Kirkland also pays regular nursing home visits to his beloved but senile grandfather Sam Kirkland (Lee Strasberg) Arthur was abandoned by his parents at a young age; it was Sam who raised Arthur and put him through law school.
Split into simpler sentences: Kirkland also pays regular nursing home visits to his beloved Grandfather Sam (Lee Strasberg), who is becoming senile. It is revealed that Arthur was abandoned by his parents at a young age and it was Sam who raised him and put him through law school.