An old man and a young child sat under the tree .Which type of sentence is this(simple,/ compound,/complex )?

The sentence "An old man and a young child sat under the tree" is a simple sentence, because it consists of only one independent clause with a subject ("old man and a young child") and a predicate ("sat under the tree").

What is the greater challenge for the old man, struggle with the marlin or fight against
with the marlin