(1) Many American men were drafted during World War II. (2) Many other men volunteered to serve. (3) In fact, so many men entered the armed services that professional baseball experienced a shortage of good players. (4) Philip K. Wrigley had an interesting solution to the problem. (5) He started a new league. (6) It was called the All-American Girls Professional Baseball League (AAGPBL). (7) To find good players, he scouted women’s softball clubs. (8) They were very popular at that time. (9) The AAGPBL was a hit. (10) In 1948, the year in which the league reached its high point of popularity, more than a million fans came to watch AAGPBL games. (11) The league produced many fine players, including Mary “Bonnie” Baker. (12) Dorothy Kamenshek was also a fine player. (13) After World War II ended, the AAGPBL declined in popularity. Which is the most effective way to combine sentences 1 and 2?

The most effective way would be to provide a contrast. For that, you need a linking word that expresses the meaning of contrast. You could use words like 'while, in contrast, but' among others. So a combination of sentence 1 and 2 could be "Many American men were drafted during World War II, while other men volunteered to serve"

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