They're actually both teachers.
( They ( ( ( 're actually ) ( both teachers ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBP 're) (ADVP (RB actually)) (NP (DT both) (NNS teachers))) (. .)))
They teach people how to do things.
( They ( ( ( teach people ) ( how ( to ( do things ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBP teach) (NP (NNS people)) (SBAR (WHADVP (WRB how)) (S (VP (TO to) (VP (VB do) (NP (NNS things))))))) (. .)))