Complex sentence: In the season three episode "Arnold & Lila", Helga writes on a wall "Arnold loves Helga"; however, when she sees the girls approaching, she hastily changes it to read "Arnold loves Lila".
Split into simpler sentences: In the season three episode "Arnold & Lila", Helga writes on a wall "Arnold loves Helga". However, when she sees the girls approaching, she hastily changes it to read "Arnold loves Lila".