What is wrong with a sentence? I know a doctor which last name is doctodoctor

I know a doctor whose last name is Doctodoctor.
Or is it like this
I know a doctor whose. The last name is Doctodoctor.

Read the presentation assignment. the intended audience for this presentation is a group of research four in-state colleges. learn about each school including its location and population. then gather information about the courses of study offered at each school. you should also collect other interesting facts, such as school colors, mascots, and athletic offerings. you will present a speech to your classmates that explains your findings, and we will save the results. this information will be of great value in the next few years. college professors. college students high school teachers. high school students.