Ergonomic Keyboard

I bought a ergonomic keyboard designed by Microsoft because Amazon had had a time sale. The keys of this keyboard is divided into right and left, and the center is swelling. This curved keyboard layout is based on ergonomics in order to let us rest our hand and wrist, and let us reach keys easily. However, it is difficult for me to type letters using this keyboard for now. That is because I usually type 'B' by my right hand while 'B' key is left side on this keyboard. As a result of measuring my typing using this keyboard, mistyped rate increased 30% and typing speed decreased 40%. I need many practice to master it.

• I bought a ergonomic keyboard designed by Microsoft because Amazon had had a time sale.
• I bought a ergonomic keyboard designed by Microsoft because Amazon had had a time sale.

• The keys of this keyboard is divided into right and left, and the center is swelling.
• The keys of this keyboard are divided into right and left, and the center is domed.

  I am not sure what the best word is for the rounded middle of the keyboard, but swelling didn't seem right.

• This curved keyboard layout is based on ergonomics in order to let us rest our hand and wrist, and let us reach keys easily.
• This curved keyboard layout is based on ergonomics in order to let us rest our hands and wrists, and let us reach keys easily.

  Because "let us reach keys easily" is not a complete sentence by itself, you don't put a comma before the "and."

• However, it is difficult for me to type letters using this keyboard for now.
• However, it has been difficult for me to type letters using this keyboard so far.

• That is because I usually type 'B' by my right hand while 'B' key is left side on this keyboard.
• That is because I usually type 'B' with my right hand, but the 'B' key is on left side of this keyboard.

• As a result of measuring my typing using this keyboard, mistyped rate increased 30% and typing speed decreased 40%.
• I measured my typing speed using this keyboard and, as a result of the split key layout, my error rate increased 30% and my typing speed decreased 40%.

• I need many practice to master it.
• I need more practice to master it.