Complex sentence: Sandstorm is known for having a fierce personality and easily annoyed, but is also capable of being gentle, however, as seen by her interactions with Firestar, her children, Squirrelflight and Leafpool, and her grandchildren, Lionblaze, Hollyleaf, and Jayfeather.
Split into simpler sentences: Sandstorm is known for having a fierce personality and easily annoyed. She is also capable of being gentle, however, as seen by her interactions with Firestar, her children, Squirrelflight and Leafpool, and her grandchildren, Lionblaze, Hollyleaf, and Jayfeather.