Complex sentence: The Stagg tree (also formerly known as the Day Tree) is a Giant Sequoia in Alder Creek Grove, it is the fifth largest tree in the world and is believed to be over 3,000 years old.
Split into simpler sentences: The Stagg tree (also formerly known as the Day Tree) is a Giant Sequoia in Alder Creek Grove. It is the fifth largest tree in the world and is believed to be over 3,000 years old.