Derrick and Melissa had been practicing for the last two weeks, but she still felt like they weren't ready. Without changing the meaning, what is the best way to change this compound sentence into two simple sentences?
a. Derrick and Melissa had been practicing for the last two weeks. She still felt like they weren't ready.
b. Derrick and Melissa had been practicing for the last two weeks, but she still felt like. They weren't ready.
c. Derrick and Melissa had been practicing for the last two weeks. But still felt like they weren't ready.
d. Derrick and Melissa had been practicing. For the last two weeks, she still felt like they weren't ready.
