How to put these in a compound sentence?

Simple-Dolphins are very intelligent, social creatures.

Simple-Katy is thinking she might like to become a marine biologist one day

A compound sentence has two independent clauses.

Study this site.

http://www.eslbee.com/sentences.htm

I'll be glad to check your sentences.

can you at least start the second one for me please

Katy is thinking she might like to become a marine biologist one day

Katy is thinking she might like to become a marine biologist, but she's also interested in veterinary science.

To form a compound sentence, you can combine these two simple sentences using a coordinating conjunction, such as "and," "but," or "so." Here are a few examples:

1. Dolphins are very intelligent, social creatures, and Katy is thinking she might like to become a marine biologist one day.
2. Dolphins are very intelligent, social creatures, but Katy is thinking she might like to become a marine biologist one day.
3. Dolphins are very intelligent, social creatures, so Katy is thinking she might like to become a marine biologist one day.

These examples demonstrate how the coordinating conjunction joins the two simple sentences to create a compound sentence.