Complex sentence: His war-time wound kept bothering him in old age, especially during cold months but he lived long enough to play golf in the early 1960s and to see June 12 declared as Independence Day.
Split into simpler sentences: His war-time wound kept bothering him in old age, especially during cold months. But he lived long enough to play golf in the early 1960s and to see June 12 declared as Independence Day.