Complex sentence: However, after the birds and the watermelons arrived at the family house Hamilton found that Angelica's condition did not improve and he and his wife started suspecting that their daughter might be suffering from a mental condition.
Split into simpler sentences: However, after the birds and the watermelons arrived at the family house Alexander found that Angelica's condition was not improving. It was at this point where Alexander and Elizabeth started suspecting that their daughter might be suffering from a mental condition.