Question

Which sentence does not correct this run-on sentence?
Kenny's dad has a collection of guitars sometimes he lets us play them.
a. Kenny's dad has a collection of guitars; sometimes he lets us play them.
b. Kenny's dad has a collection of guitars, and sometimes he lets us play them.
c. Kenny's dad has a collection of guitars, sometimes he lets us play them.
d. Kenny's dad has a collection of guitars. Sometimes he lets us play them.

Answer 1

D doesnt fix the sentence because the period in this case breaks the sentence apart but into an incomplete and complete sentence. 

"Sometimes he lets us play them." isnt a complete sentence which is a period isnt the way to make this run on sentence better.