The comma in the second sentence was mandatory in the old orthography before 1996 but is optional in the current orthography. It introduces an infinitive clause. See Duden D114-117.

The same would apply to the first sentence if it was not for the verb scheinen which is never used with comma.

The comma in the second sentence was mandatory in the old orthography before 1996 but is optional in the current orthography. It introduces an infinitive clause. See Duden D114-117.

The same would apply to the first sentence if it was not for the verb scheinen which is never used with comma (Duden D117).

For further reference, see here.