Complex sentence: He interprets it as a sign that she will be the main breadwinner: more recently, he appears to accept that, since they have discussed that if they have children, he will probably stay at home with them while she continues to work.
Split into simpler sentences: He interprets it as a sign that she will be the main breadwinner. More recently, Howard accepts that Bernadette may be the main breadwinner in their relationship, since they have agreed that if they have children, he will stay at home with them while she continues to work.